Radiation Therapy & Side Effect
On this page:
- What is radiation therapy?
Radiation therapy (also called radiotherapy, x-ray therapy, or irradiation)
is the use of a certain type of energy (called ionizing radiation) to
kill cancer cells and shrink tumors. Radiation therapy injures or destroys
cells in the area being treated (the "target tissue") by damaging their
genetic material, making it impossible for these cells to continue to
grow and divide. Although radiation damages both cancer cells and normal
cells, most normal cells can recover from the effects of radiation and
function properly. The goal of radiation therapy is to damage as many
cancer cells as possible, while limiting harm to nearby healthy tissue.
There are different types of radiation and different ways to deliver
the radiation. For example, certain types of radiation can penetrate more
deeply into the body than can others. In addition, some types of radiation
can be very finely controlled to treat only a small area (an inch of tissue,
for example) without damaging nearby tissues and organs. Other types of
radiation are better for treating larger areas.
In some cases, the goal of radiation treatment is the complete destruction
of an entire tumor. In other cases, the aim is to shrink a tumor and relieve
symptoms. In either case, doctors plan treatment to spare as much healthy
tissue as possible.
About half of all cancer patients receive some type of radiation therapy.
Radiation therapy may be used alone or in combination with other cancer
treatments, such as chemotherapy or surgery. In some cases, a patient
may receive more than one type of radiation therapy.
- When is radiation therapy used?
Radiation therapy may be used to treat almost every type of solid tumor,
including cancers of the brain, breast, cervix, larynx, lung, pancreas,
prostate, skin, spine, stomach, uterus, or soft tissue sarcomas. Radiation
can also be used to treat leukemia and lymphoma (cancers of the blood-forming
cells and lymphatic system, respectively). Radiation dose to each site
depends on a number of factors, including the type of cancer and whether
there are tissues and organs nearby that may be damaged by radiation.
For some types of cancer, radiation may be given to areas that do not
have evidence of cancer. This is done to prevent cancer cells from growing
in the area receiving the radiation. This technique is called prophylactic
Radiation therapy also can be given to help reduce symptoms such as pain
from cancer that has spread to the bones or other parts of the body. This
is called palliative radiation therapy.
- What is the difference between external radiation therapy, internal radiation
therapy (brachytherapy), and systemic radiation therapy? When are these
Radiation may come from a machine outside the body (external radiation),
may be placed inside the body (internal radiation), or may use unsealed
radioactive materials that go throughout the body (systemic radiation
therapy). The type of radiation to be given depends on the type of cancer,
its location, how far into the body the radiation will need to go, the
patient's general health and medical history, whether the patient will
have other types of cancer treatment, and other factors.
Most people who receive radiation therapy for cancer have external radiation.
Some patients have both external and internal or systemic radiation therapy,
either one after the other or at the same time.
- External radiation therapy usually is given on an outpatient basis;
most patients do not need to stay in the hospital. External radiation
therapy is used to treat most types of cancer, including cancer of the
bladder, brain, breast, cervix, larynx, lung, prostate, and vagina.
In addition, external radiation may be used to relieve pain or ease
other problems when cancer spreads to other parts of the body from the
- Intraoperative radiation therapy (IORT) is a form of external
radiation that is given during surgery. IORT is used to treat localized
cancers that cannot be completely removed or that have a high risk
of recurring (coming back) in nearby tissues. After all or most
of the cancer is removed, one large, high-energy dose of radiation
is aimed directly at the tumor site during surgery (nearby healthy
tissue is protected with special shields). The patient stays in
the hospital to recover from the surgery. IORT may be used in the
treatment of thyroid and colorectal cancers, gynecological cancers,
cancer of the small intestine, and cancer of the pancreas. It is
also being studied in clinical trials (research studies) to treat
some types of brain tumors and pelvic sarcomas in adults.
- Prophylactic cranial irradiation (PCI) is external radiation given
to the brain when the primary cancer (for example, small cell lung
cancer) has a high risk of spreading to the brain.
- Internal radiation therapy (also called brachytherapy) uses radiation
that is placed very close to or inside the tumor. The radiation source
is usually sealed in a small holder called an implant. Implants may
be in the form of thin wires, plastic tubes called catheters, ribbons,
capsules, or seeds. The implant is put directly into the body. Internal
radiation therapy may require a hospital stay.
Internal radiation is usually delivered in one of two ways, each of
which is described below. Both methods use sealed implants.
- Interstitial radiation therapy is inserted into tissue at or near
the tumor site. It is used to treat tumors of the head and neck,
prostate, cervix, ovary, breast, and perianal and pelvic regions.
Some women treated with external radiation for breast cancer receive
a "booster dose" of radiation that may use interstitial radiation
or external radiation.
- Intracavitary or intraluminal radiation therapy is inserted into
the body with an applicator. It is commonly used in the treatment
of uterine cancer. Researchers are also studying these types of
internal radiation therapy for other cancers, including breast,
bronchial, cervical, gallbladder, oral, rectal, tracheal, uterine,
- Systemic radiation therapy uses radioactive materials such as
iodine 131 and strontium 89. The materials may be taken by mouth
or injected into the body. Systemic radiation therapy is sometimes
used to treat cancer of the thyroid and adult non-Hodgkin's lymphoma.
Researchers are investigating agents to treat other types of cancer.
- Will radiation therapy make the patient radioactive?
Cancer patients receiving radiation therapy are often concerned that
the treatment will make them radioactive. The answer to this question
depends on the type of radiation therapy being given.
External radiation therapy will not make the patient radioactive. Patients
do not need to avoid being around other people because of the treatment.
Internal radiation therapy (interstitial, intracavitary, or intraluminal)
that involves sealed implants emits radioactivity, so a stay in the hospital
may be needed. Certain precautions are taken to protect hospital staff
and visitors. The sealed sources deliver most of their radiation mainly
around the area of the implant, so while the area around the implant is
radioactive, the patient's whole body is not radioactive.
Systemic radiation therapy uses unsealed radioactive materials that travel
throughout the body. Some of this radioactive material will leave the
body through saliva, sweat, and urine before the radioactivity decays,
making these fluids radioactive. Therefore, certain precautions are sometimes
used for people who come in close contact with the patient. The patient's
doctor or nurse will provide information if these special precautions
- How does the doctor measure the dose of radiation?
The amount of radiation absorbed by the tissues is called the radiation
dose (or dosage). Before 1985, dose was measured in a unit called a "rad"
(radiation absorbed dose). Now the unit is called a gray (abbreviated
as Gy). One Gy is equal to 100 rads; one centigray (abbreviated as cGy)
is the same as 1 rad.
Different tissues can tolerate various amounts of radiation (measured
in centigrays). For example, the liver can receive a total dose of 3,000
cGy, while the kidneys can tolerate only 1,800 cGy. The total dose of
radiation is usually divided into smaller doses (called fractions) that
are given daily over a specific time period. This maximizes the destruction
of cancer cells while minimizing the damage to healthy tissue.
The doctor works with a figure called the therapeutic ratio. This ratio
compares the damage to the cancer cells with the damage to healthy cells.
Techniques are available to increase the damage to cancer cells without
doing greater harm to healthy tissues. These techniques are discussed
in Questions 8, 9, and 15.
- What are the sources of energy for external radiation therapy?
The energy (source of radiation) used in external radiation therapy may
come from the following:
- X-rays or gamma rays, which are both forms of electromagnetic radiation.
Although they are produced in different ways, both use photons (packets
- X-rays are created by machines called linear accelerators. Depending
on the amount of energy the x-rays have, they can be used to destroy
cancer cells on the surface of the body (lower energy) or deeper
into tissues and organs (higher energy). Compared with other types
of radiation, x-rays can deliver radiation to a relatively large
- Gamma rays are produced when isotopes of certain elements (such
as iridium and cobalt 60) release radiation energy as they break
down. Each element breaks down at a specific rate and each gives
off a different amount of energy, which affects how deeply it can
penetrate into the body. (Gamma rays produced by the breakdown of
cobalt 60 are used in the treatment called the "gamma knife," which
is discussed in Question 8).
- Particle beams use fast-moving subatomic particles instead of photons.
This type of radiation may be called particle beam radiation therapy
or particulate radiation. Particle beams are created by linear accelerators,
synchrotrons, and cyclotrons, which produce and accelerate the particles
required for this type of radiation therapy. Particle beam therapy uses
electrons, which are produced by an x-ray tube (this may be called electron-beam
radiation); neutrons, which are produced by radioactive elements and
special equipment; heavy ions (such as protons and helium); and pi-mesons
(also called pions), which are small, negatively charged particles produced
by an accelerator and a system of magnets. Unlike x-rays and gamma rays,
some particle beams can penetrate only a short distance into tissue.
Therefore, they are often used to treat cancers located on the surface
of or just below the skin.
- Proton beam therapy is a type of particle beam radiation therapy.
Protons deposit their energy over a very small area, which is called
the Bragg peak. The Bragg peak can be used to target high doses
of proton beam therapy to a tumor while doing less damage to normal
tissues in front of and behind the tumor. Proton beam therapy is
available at only a few facilities in the United States. Its use
is generally reserved for cancers that are difficult or dangerous
to treat with surgery (such as a chondrosarcoma at the base of the
skull), or it is combined with other types of radiation.
Proton beam therapy is also being used in clinical trials for intraocular
melanoma (melanoma that begins in the eye), retinoblastoma (an eye
cancer that most often occurs in children under age 5), rhabdomyosarcoma
(a tumor of the muscle tissue), some cancers of the head and neck,
and cancers of the prostate, brain, and lung.
- What are the sources of energy for internal radiation?
The energy (source of radiation) used in internal radiation comes from
the radioactive isotope in radioactive iodine (iodine 125 or iodine 131),
and from strontium 89, phosphorous, palladium, cesium, iridium, phosphate,
or cobalt. Other sources are being investigated.
- What are stereotactic radiosurgery and stereotactic radiotherapy?
Stereotactic (or stereotaxic) radiosurgery uses a large dose of radiation
to destroy tumor tissue in the brain. The procedure does not involve actual
surgery. The patient's head is placed in a special frame, which is attached
to the patient' skull. The frame is used to aim high-dose radiation beams
directly at the tumor inside the patient's head. The dose and area receiving
the radiation are coordinated very precisely. Most nearby tissues are
not damaged by this procedure.
Stereotactic radiosurgery can be done in one of three ways. The most
common technique uses a linear accelerator to administer high-energy photon
radiation to the tumor (called "linac-based stereotactic radiosurgery").
The gamma knife, the second most common technique, uses cobalt 60 to deliver
radiation. The third technique uses heavy charged particle beams (such
as protons and helium ions) to deliver stereotactic radiation to the tumor.
Stereotactic radiosurgery is mostly used in the treatment of small benign
and malignant brain tumors (including meningiomas, acoustic neuromas,
and pituitary cancer). It can also be used to treat other conditions (for
example, Parkinson's disease and epilepsy). In addition, stereotactic
radiosurgery can be used to treat metastatic brain tumors (cancer that
has spread to the brain from another part of the body) either alone or
along with whole-brain radiation therapy. (Whole-brain radiation therapy
is a form of external radiation therapy that treats the entire brain with
Stereotactic radiotherapy uses essentially the same approach as stereotactic
radiosurgery to deliver radiation to the target tissue. However, stereotactic
radiotherapy uses multiple small fractions of radiation as opposed to
one large dose. Giving multiple smaller doses may improve outcomes and
minimize side effects. Stereotactic radiotherapy is used to treat tumors
in the brain as well as other parts of the body.
Clinical trials are under way to study the effectiveness of stereotactic
radiosurgery and stereotactic radiotherapy alone and in combination with
other types of radiation therapy.
- What other methods are in use or being studied to improve external radiation
A number of refinements and techniques are in use or under study to improve
the effectiveness of external radiation therapy. These are described below:
- Three-dimensional (3-D) conformal radiation therapy. Traditionally,
the planning of radiation treatments has been done in two dimensions
(width and height). Three-dimensional (3-D) conformal radiation therapy
uses computer technology to allow doctors to more precisely target a
tumor with radiation beams (using width, height, and depth). Many radiation
oncologists use this technique. A 3-D image of a tumor can be obtained
using computed tomography (CT), magnetic resonance imaging (MRI), positron
emission tomography (PET), or single photon emission computed tomography
(SPECT). Using information from the image, special computer programs
design radiation beams that "conform" to the shape of the tumor. Because
the healthy tissue surrounding the tumor is largely spared by this technique,
higher doses of radiation can be used to treat the cancer. Improved
outcomes with 3-D conformal radiation therapy have been reported for
nasopharyngeal, prostate, lung, liver, and brain cancers.
- Intensity-modulated radiation therapy (IMRT). IMRT is a new type of
3-D conformal radiation therapy that uses radiation beams (usually x-rays)
of varying intensities to deliver different doses of radiation to small
areas of tissue at the same time. The technology allows for the delivery
of higher doses of radiation within the tumor and lower doses to nearby
healthy tissue. Some techniques deliver a higher dose of radiation to
the patient each day, potentially shortening the overall treatment time
and improving the success of the treatment. IMRT may also lead to fewer
side effects during treatment.
The radiation is delivered by a linear accelerator that is equipped
with a multileaf collimator (a collimator helps to shape or sculpt
the beams of radiation). The equipment can be rotated around the patient
so that radiation beams can be sent from the best angles. The beams
conform as closely as possible to the shape of the tumor. Because
IMRT equipment is highly specialized, not every radiation oncology
center uses IMRT.
This new technology has been used to treat tumors in the brain, head
and neck, nasopharynx, breast, liver, lung, prostate, and uterus.
However, IMRT is not appropriate or necessary for every patient or
tumor type. Long-term results following treatment with IMRT are becoming
- What are low-LET and high-LET radiation?
Linear energy transfer (LET) describes the rate at which a type of radiation
deposits energy as it passes through tissue. Higher levels of deposited
energy cause more cells to be killed by a given dose of radiation therapy.
Different types of radiation have different levels of LET. For example,
x-rays, gamma rays, and electrons are known as low-LET radiation. Neutrons,
heavy ions, and pions are classified as high-LET radiation.
Most high-LET radiation is investigational treatment. The cost of the
equipment and the amount of specialized training needed to perform high-LET
radiation therapy restrict its use to only a few facilities in the United
- Who plans and delivers the radiation treatment to the patient?
Many health care providers help to plan and deliver radiation treatment
to the patient. The radiation therapy team includes the radiation oncologist,
a doctor who specializes in using radiation to treat cancer; the dosimetrist,
who determines the proper radiation dose; the radiation physicist, who
makes sure that the machine delivers the right amount of radiation to
the correct site in the body; and the radiation therapist, who gives the
radiation treatment. Often, radiation treatment is only one part of the
patient's total therapy. Combined modality therapy, the use of radiation
with drug therapy, is commonly used.
The radiation oncologist also works with the medical or pediatric oncologist,
surgeon, radiologist (a doctor who specializes in creating and interpreting
pictures of areas inside the body), pathologist (a doctor who identifies
diseases by studying cells and tissues under a microscope), and others
to plan the patient's total course of therapy. A close working relationship
between the radiation oncologist, medical or pediatric oncologist, surgeon,
radiologist, and pathologist is important in planning the total therapy.
- What is treatment planning, and why is it important?
Because there are so many types of radiation and many ways to deliver
it, treatment planning is a very important first step for every patient
who will have radiation therapy. Before radiation therapy is given, the
patient's radiation therapy team determines the amount and type of radiation
the patient will receive.
If the patient will have external radiation, the radiation oncologist
uses a process called simulation to define where to aim the radiation.
During simulation, the patient lies very still on an examining table while
the radiation therapist uses a special x-ray machine to define the treatment
port or field—the exact place on the body where the radiation will be
aimed. Most patients have more than one treatment port. Simulation may
also involve CT scans or other imaging studies to help the radiation therapist
plan how to direct the radiation. The simulation may result in some changes
to the treatment plan so that the greatest possible amount of healthy
tissue can be spared from receiving radiation.
The areas to receive radiation are marked with either a temporary or
permanent marker, tiny dots or a "tattoo" showing where the radiation
should be aimed. These marks are also used to determine the exact site
of the initial treatments if the patient should need radiation treatment
Depending on the type of radiation treatment, the radiation therapist
may make body molds or other devices that keep the patient from moving
during treatment. These are usually made from foam, plastic, or plaster.
In some cases, the therapist will also make shields that cannot be penetrated
by radiation to protect organs and tissues near the treatment field.
When the simulation is complete, the radiation therapy team meets to
decide how much radiation is needed (the dose of radiation), how it should
be delivered, and how many treatments the patient should have.
- What are radiosensitizers and radioprotectors?
Radiosensitizers and radioprotectors are chemicals that modify a cell's
response to radiation. Radiosensitizers are drugs that make cancer cells
more sensitive to the effects of radiation therapy. Several compounds
are under study as radiosensitizers. In addition, some anticancer drugs,
such as 5-fluorouracil and cisplatin, make cancer cells more sensitive
to radiation therapy.
Radioprotectors (also called radioprotectants) are drugs that protect
normal (noncancerous) cells from the damage caused by radiation therapy.
These agents promote the repair of normal cells that are exposed to radiation.
Amifostine (trade name Ethyol®) is the only drug approved by the U.S.
Food and Drug Administration (FDA) as a radioprotector. It helps to reduce
the dry mouth that can occur if the parotid glands (which help to produce
saliva and are located near the ear) receive a large dose of radiation.
Additional studies are under way to determine whether amifostine is effective
when used with radiation therapy to treat other types of cancer. Other
compounds are also under study as radioprotectors.
- What are radiopharmaceuticals? How are they used?
Radiopharmaceuticals, also known as radionucleotides, are radioactive
drugs used to treat cancer, including thyroid cancer, cancer that recurs
in the chest wall, and pain caused by the spread of cancer to the bone
(bone metastases). The most commonly used radiopharmaceuticals are samarium
153 (Quadramet®) and strontium 89 (Metastron™). These drugs are approved
by the FDA to relieve pain caused by bone metastases. Both agents are
given intravenously (by injection into a vein), usually on an outpatient
basis; sometimes they are given in addition to external beam radiation.
Other types of radiopharmaceuticals, such as phosphorous 32, rhodium 186,
and gallium nitrate, are not used as frequently. Still other radiopharmaceuticals
are under investigation.
- What are some new approaches to radiation therapy?
Hyperthermia, the use of heat, is being studied in conjunction with radiation
therapy. Researchers have found that the combination of heat and radiation
can increase the response rate of some tumors.
Researchers are also studying the use of radiolabeled antibodies to deliver
doses of radiation directly to the cancer site (radioimmunotherapy). Antibodies
are highly specific proteins that are made by the body in response to
the presence of antigens (substances recognized as foreign by the immune
system). Some tumor cells contain specific antigens that trigger the production
of tumor-specific antibodies. Large quantities of these antibodies can
be made in the laboratory and attached to radioactive substances (a process
known as radiolabeling). Once injected into the body, the antibodies seek
out cancer cells, which are destroyed by the radiation. This approach
can minimize the risk of radiation damage to healthy cells.
The success of this technique depends on identifying appropriate radioactive
substances and determining the safe and effective dose of radiation that
can be delivered in this way. Two radioimmunotherapy treatments, ibritumomab
tiuxetan (Zevalin®) and tositumomab and iodine 131 tositumomab (Bexxar®),
have been approved for advanced adult non-Hodgkin's lymphoma (NHL). Clinical
trials of radioimmunotherapy are under way with a number of cancers, including
leukemia, NHL, colorectal cancer, and cancers of the liver, lung, brain,
prostate, thyroid, breast, ovary, and pancreas.
Scientific advances have led to the discovery of new targets that are
being investigated to attract radioactive materials directly to cancer
cells. Laboratory and clinical research is in progress using the new molecular
therapeutic agents, such as gefitinib (Iressa®) and imatinib mesylate
(Gleevec®), with radiation therapy
Radiation therapy may vary somewhat among different doctors, hospitals,
and treatment centers. Therefore, your treatment or the advice of your doctor
(the radiation oncologist) may be different from what you read here. Be sure
to ask questions and discuss your concerns with your doctor, nurse, or radiation
therapist. Ask whether they have any additional written information that might
|FAST FACTS ABOUT RADIATION
- Radiation treatments are painless.
- External radiation treatment does not make you radioactive.
- Treatments are usually scheduled every day except Saturday and Sunday.
- You need to allow 30 minutes for each treatment session although the treatment
itself takes only a few minutes.
- It's important to get plenty of rest and to eat a well-balanced diet during the
course of your radiation therapy.
- Skin in the treated area may become sensitive and easily irritated.
- Side effects of radiation treatment are usually temporary and they vary depending
on the area of the body that is being treated.
in Cancer Treatment
Radiation therapy (sometimes called radiotherapy, x-ray therapy, or irradiation)
is the treatment of disease using penetrating beams of high energy waves or streams
of particles called radiation.
years ago doctors learned how to use this energy to "see" inside the body and find disease. You've probably seen a chest x-ray or x-ray
pictures of your teeth or your bones. At high doses (many times those used
for x-ray exams) radiation is used to treat cancer and other illnesses.
The radiation used for cancer treatment comes from special machines or from
radioactive substances. Radiation therapy equipment aims specific amounts
of the radiation at tumors or areas of the body where there is disease.
Radiation in high doses kills cells or keeps them from growing and dividing.
Because cancer cells grow and divide more rapidly than most of the normal cells
around them, radiation therapy can successfully treat many kinds of cancer.
Normal cells are also affected by radiation but, unlike cancer cells, most of
them recover from the effects of radiation.
protect normal cells, doctors carefully limit the doses of radiation and spread
the treatment out over time. They also shield as much normal tissue as possible
while they aim the radiation at the site of the cancer.
The goal of radiation therapy is to kill the cancer cells with as little
risk as possible to normal cells. Radiation therapy can be used to treat many
kinds of cancer in almost any part of the body. In fact, more than half of
all people with cancer are treated with some form of radiation. For many cancer
patients, radiation is the only kind of treatment they need. Thousands of people
who have had radiation therapy alone or in combination with other types of
cancer treatment are free of cancer.
Radiation treatment, like surgery, is a local treatment — it affects the cancer
cells only in a specific area of the body. Sometimes doctors add radiation
therapy to treatments that reach all parts of the body (systemic treatment)
such as chemotherapy, or biological therapy to improve treatment results. You
may hear your doctor use the term, adjuvant therapy , for a treatment that
is added to, and given after, the primary therapy.
Radiation therapy is often used with surgery to treat cancer. Doctors may use
radiation before surgery to shrink a tumor. This makes it easier to remove
the cancerous tissue and may allow the surgeon to perform less radical surgery.
Radiation therapy may be used after surgery to stop the growth of cancer cells
that may remain. Your doctor may choose to use radiation therapy and surgery
at the same time. This procedure is known as intraoperative radiation.
In some cases, instead of surgery, doctors use radiation along with anticancer
drugs (chemotherapy) to destroy the cancer. Radiation may be given before,
during, or after chemotherapy. Doctors carefully tailor this combination treatment
to each patient's needs depending on the type of cancer, its location, and
its size. The purpose of radiation treatment before or during chemotherapy
is to make the tumor smaller and thus improve the effectiveness of the anticancer
drugs. Doctors sometimes recommend that a patient complete chemotherapy and
then have radiation treatment to kill any cancer cells that might remain. When curing the cancer is not possible, radiation therapy can be used to shrink
tumors and reduce pressure, pain, and other symptoms of cancer. This is called
palliative care or palliation. Many cancer patients find that they have a better
quality of life when radiation is used for this purpose.
The brief high doses of radiation that damage or destroy cancer cells
can also injure or kill normal cells. These effects of radiation on normal
cells cause treatment side effects. Most side effects of radiation treatment
are well known and, with the help of your doctor and nurse, easily treated.
The side effects of radiation therapy and what to do about them are discussed
in the Managing Side Effects section.
The risk of side effects is usually less than the benefit of killing cancer
cells. Your doctor will not advise you to have any treatment unless the benefits
-- control of disease and relief from symptoms -- are greater than the known
Radiation therapy can be given in one of two ways: external or internal.
Some patients have both, one after the other.
Most people who receive radiation therapy for cancer have external radiation
. It is usually given during outpatient visits to a hospital or treatment center.
In external radiation therapy, a machine directs the high-energy rays at the
cancer and a small margin of normal tissue surrounding it.
The various machines used for external radiation work in slightly different ways.
Some are better for treating cancers near the skin surface; others work best
on cancers deeper in the body. The most common type of machine used for radiation
therapy is called a linear accelerator . Some radiation machines use a variety
of radioactive substances (such as cobalt-60, for example) as the source of
high-energy rays. Your doctor decides which type of radiation therapy machine
is best for you. You will find more information about external radiation in
the next chapter.
When internal radiation therapy is used, the radiation source is placed inside
the body. This method of radiation treatment is called brachytherapy or implant
therapy. The source of the radiation (such as radioactive iodine, for example)
sealed in a small holder is called an implant . Implants may be thin wires,
plastic tubes (catheters), capsules, or seeds. An implant may be placed directly
into a tumor or inserted into a body cavity. Sometimes, after a tumor has been
removed by surgery, the implant is placed in the 'tumor bed' (the area from
which the tumor was removed) to kill any tumor cells that may remain.
Another type of internal radiation therapy uses unsealed radioactive materials
which may be taken by mouth or injected into the body. If you have this type
of treatment, you may need to stay in the hospital for several days.
A doctor who specializes in using radiation to treat cancer — a radiation
oncologist — will prescribe the type and amount of treatment that is right
for you. The radiation oncologist is the person referred to as "your doctor" throughout this booklet. The radiation oncologist works closely with the other
doctors and health care professionals involved in your care. This highly trained
health care team may include:
- The radiation physicist, who makes sure that the equipment is working
properly and that the machines deliver the right dose of radiation. The
physicist also works closely with your doctor to plan your treatment.
- The dosimetrist, who works under the direction of your doctor and the
radiation physicist and helps carry out your treatment plan by calculating
the amount of radiation to be delivered to the cancer and normal tissues
that are nearby.
- The radiation therapist, who positions you for your treatments and runs
the equipment that delivers the radiation.
- The radiation nurse, who will coordinate your care, help you learn about
treatment, and tell you how to manage side effects. The nurse can also answer
questions you or family members may have about your treatment.
Your health care team also may include a physician assistant, radiologist,
dietitian, radiation oncologist, physical therapist, social worker, or other
health care professional.
Treatment of cancer with radiation can be costly. It requires very complex
equipment and the services of many health care professionals. The exact cost
of your radiation therapy will depend on the type and number of treatments
Most health insurance policies, including Part B of Medicare, cover charges for
radiation therapy. It's a good idea to talk with your doctor's office staff
or the hospital business office about your policy and how expected costs will
In some states, the Medicaid program may help you pay for treatments.
You can find out from the office that handles social services in your city
or county whether you are eligible for Medicaid and whether your radiation
therapy is a covered expense.
The high energy rays used for radiation therapy can come from a variety
of sources. Your doctor may choose to use x-rays, an electron beam, or cobalt-60
gamma rays. Some cancer treatment centers have special equipment that produces
beams of protons or neutrons for radiation therapy. The type of radiation your
doctor decides to use depends on what kind of cancer you have and how far into
your body the radiation should go. High-energy radiation is used to treat many
types of cancer. Low-energy x-rays are used to treat some kinds of skin diseases.
After a physical exam and a review of your medical history, the doctor plans
your treatment. In a process called simulation, you will be asked to lie very
still on an examining table while the radiation therapist uses a special x-ray
machine to define your treatment port or field. This is the exact place on
your body where the radiation will be aimed. Depending on the location of your
cancer, you may have more than one treatment port.
Simulation may also involve CT scans or other imaging studies to plan how to
direct the radiation. Depending on the type of treatment you will be receiving,
body molds or other devices that keep you from moving during treatment (immobilization
devices) may be made at this time. They will be used each time you have treatment
to be sure that you are positioned correctly. Simulation may take from a half
hour to about 2 hours.
The radiation therapist often will mark the treatment port on your skin with
tattoos or tiny dots of colored, permanent ink. It's important that the radiation
be targeted at the same area each time. If the dots appear to be fading, tell
your radiation therapist who will darken them so that they can be seen easily.
Once simulation has been done, your doctor will meet with the radiation physicist
and the dosimetrist. Based on the results of your medical history, lab tests,
x-rays, other treatments you may have had, and the location and kind of cancer
you have, they will decide how much radiation is needed, what kind of machine
to use to deliver it, and how many treatments you should have.
After you have started the treatments, your doctor and the other members of your
health care team will follow your progress by checking your response to treatment
and how you are feeling at least once a week. When necessary, your doctor may
revise the treatment plan by changing the radiation dose or the number and
length of your remaining radiation sessions.
Your nurse will be available daily to discuss your concerns and answer any questions
you may have. Be sure to tell your nurse if you are having any side effects
or if you notice any unusual symptoms.
For most types of cancer, radiation therapy usually is given 5 days a
week for 6 or 7 weeks. (When radiation is used for palliative care, the course
of treatment is shorter, usually 2 to 3 weeks.) The total dose of radiation
and the number of treatments you need will depend on the size, location, and
kind of cancer you have, your general health, and other medical treatments
you may be receiving.
Using many small doses of daily radiation rather than a few large doses helps
protect normal body tissues in the treatment area. Weekend rest breaks allow
normal cells to recover.
|It's very important
that you have all of your scheduled treatments to get the most benefit
from your therapy. Missing or delaying treatments can lessen the effectiveness
of your radiation treatment.
Before each treatment, you may need to change into a hospital gown or
robe. It's best to wear clothing that is easy to take off and put on again.
In the treatment room, the radiation therapist will use the marks on your skin
to locate the treatment area and to position you correctly. You may sit in
a special chair or lie down on a treatment table. For each external radiation
therapy session, you will be in the treatment room about 15 to 30 minutes,
but you will be getting radiation for only about 1 to 5 minutes of that time.
Receiving external radiation treatments is painless, just like having an x-ray
taken. You will not hear, see, or smell the radiation.
The radiation therapist may put special shields (or blocks) between the machine
and certain parts of your body to help protect normal tissues and organs. There
might also be plastic or plaster forms that help you stay in exactly the right
place. You need to remain very still during the treatment so that the radiation reaches
only the area where it's needed and the same area is treated each time. You don't have to hold your breath — just breathe normally.
The radiation therapist will leave the treatment room before your treatment begins.
The radiation machine is controlled from a nearby area. You will be watched
on a television screen or through a window in the control room. Although you
may feel alone, keep in mind that the therapist can see and hear you and even
talk with you using an intercom in the treatment room. If you should feel ill
or very uncomfortable during the treatment, tell your therapist at once. The
machine can be stopped at any time.
The machines used for radiation treatments are very large, and they make noises
as they move around your body to aim at the treatment area from different angles.
Their size and motion may be frightening at first. Remember that the machines
are being moved and controlled by your radiation therapist. They are checked
constantly to be sure they're working right. If you have concerns about anything
that happens in the treatment room, discuss these concerns with the radiation
Radiation is usually given once daily in a dose that is based on the type and
location of the tumor. In hyperfractionated radiation therapy, the daily dose
is divided into smaller doses that are given more than once a day. The treatments
usually are separated by 4 to 6 hours. Doctors are studying hyperfractionated
therapy to learn if it is equal to, or perhaps more effective than, once-a-day
therapy and whether there are fewer long-term side effects. Early results of
treatment studies of some kinds of tumors are encouraging, and hyperfractionated
therapy is becoming a more common way to give radiation treatments for some types
Intraoperative radiation combines surgery and radiation therapy. The surgeon
first removes as much of the tumor as possible. Before the surgery is completed,
a large dose of radiation is given directly to the tumor bed (the area from
which the tumor has been removed) and nearby areas where cancer cells might
have spread. Sometimes intraoperative radiation is used in addition to external
radiation therapy. This gives the cancer cells a larger amount of radiation
than would be possible using external radiation alone.
Researchers in the field of radiation therapy continue
to seek ways to improve the outcome of treatment. Their challenge is
to get a high dose of radiation to the tumor while the surrounding
normal tissue is protected from radiation damage. New methods for using
radiation to treat cancer are being investigated. Many are promising
but they are not yet widely available. You may hear the following terms
that describe some of these new methods of radiation treatment:
Three-dimensional conformal radiation therapy is a radiation technique that is being used in some cancer centers. Computer
simulation produces an accurate image of the tumor and surrounding
organs so that multiple radiation beams can be shaped exactly to the
contour of the treatment area. Because the radiation beams are precisely
focused, nearby normal tissue is spared. This technique is being used
to treat prostate cancer, lung cancer, and certain brain tumors.
Stereotactic radiosurgery, which uses gamma rays or a linear accelerator, is useful for treating certain
kinds of brain tumors and some malformations in the brain's blood vessels.
One technique, called the "gamma knife ," uses many powerful, precisely focused radiation beams. The patient wears a special
helmet to focus the gamma rays and aim them at the target tissue from
many directions. The treatment is painless and bloodless and, unlike
conventional brain surgery, there is no danger of infection. Other
systems use a linear accelerator to deliver the radiation in arcing
paths around the patient's head.
Cyberknife is a new, but less common, treatment that is being used to treat brain tumors.
This system uses a miniature radiation machine and a robotic arm that
moves around the patient's head while delivering small doses of radiation
from hundreds of directions. During treatment a computer analyzes hundreds
of brain images and adjusts for slight movements by the patient. This
makes it possible to deliver the treatment without using a frame to
hold the patient's head still. Only the tumor receives the high doses
of radiation and healthy tissue is spared.
The Peacock system is a variation of the cyberknife. It uses special machinery that delivers tiny
focused beams of radiation while it rotates around the patient's head.
The beams continuously change shape and size to conform to the shape
and size of the tumor while avoiding vital structures in the brain.
Computer software controls the intensity of the radiation.
Precision therapy is a method of radiosurgery recently developed in Sweden. It uses high doses
of radiation delivered in fewer fractions than in conventional radiation
therapy. An advanced treatment planning system permits precise targeting
from many angles. As with other advances in radiation treatment, it
allows high doses of radiation to be delivered to tumor tissue while
reducing radiation damage to healthy tissue.
External radiation therapy
does not cause your body to become radioactive. There is no need to avoid being
with other people because you are undergoing treatment. Even hugging, kissing,
or having sexual relations with others poses no risk of radiation exposure.
Most side effects of radiation therapy are related to the area that is being
treated. Many patients have no side effects at all. Your doctor and nurse will
tell you about the possible side effects you might expect and how you should
deal with them. You should contact your doctor or nurse if you have any unusual
symptoms during your treatment, such as coughing, sweating, fever, or pain.
The side effects of radiation therapy, although unpleasant, are usually not serious
and can be controlled with medication or diet. They usually go away within
a few weeks after treatment ends, although some side effects can last longer.
In the Managing Side Effects section, you will find advice on how to cope with
the side effects that might occur during and after your therapy. Always check
with your doctor or nurse about how you should deal with side effects.
Throughout your treatment, your doctor will regularly check on the effects of
the treatment. You may not be aware of changes in the cancer, but you probably
will notice decreases in pain, bleeding, or other discomfort. You may continue
to notice further improvement after your treatment is completed.
Your doctor may recommend periodic tests and physical exams to be sure that the
radiation is causing as little damage to normal cells as possible. Depending
on the area being treated, you may have routine blood tests to check the levels
of red blood cells, white blood cells, platelets; radiation treatment can cause
decreases in the levels of different blood cells.
Each patient's body responds to radiation therapy in its own way. That's
why your doctor must plan, and sometimes adjust, your treatment. In addition,
your doctor or nurse will give you suggestions for caring for yourself at home
that are specific for your treatment and the possible side effects.
Nearly all cancer patients receiving radiation therapy need to take special care
of themselves to protect their health and to help the treatment succeed.
- Before starting treatment, be sure your doctor knows about any medicines
you are taking and if you have any allergies. Do not start taking any medicine
(whether prescription or over-the-counter) during your radiation therapy
without first telling your doctor or nurse.
- Fatigue is common during radiation therapy. Your body will use a lot of
extra energy over the course of your treatment, and you may feel very tired.
Be sure to get plenty of rest and sleep as often as you feel the need. It's
common for fatigue to last for 4 to 6 weeks after your treatment has been
- Good nutrition is very important. Try to eat a balanced diet that will
prevent weight loss. For patients who have problems with eating or diet
planning, the section, Managing Side Effects, offers practical tips.
- Check with your doctor before taking vitamin supplements or herbal preparations
- Avoid wearing tight clothes such as girdles or close-fitting collars over
the treatment area.
- Be extra kind to your skin in the treatment area:
- Ask your doctor or nurse if you may use soaps, lotions, deodorants,
sun blocks, medicines, perfumes, cosmetics, talcum powder, or other
substances in the treated area.
- Wear loose, soft cotton clothing over the treated area.
- Do not wear starched or stiff clothing over the treated area.
- Do not scratch, rub, or scrub treated skin.
- Do not use adhesive tape on treated skin. If bandaging is necessary,
use paper tape and apply it outside of the treatment area. Your nurse
can help you place dressings so that you can avoid irritating the treated
- Do not apply heat or cold (heating pad, ice pack, etc.) to the treated
area. Use only lukewarm water for bathing the area.
- Use an electric shaver if you must shave the treated area but only
after checking with your doctor or nurse. Do not use a preshave lotion
or hair removal products on the treated area.
- Protect the treatment area from the sun. Do not apply sunscreens just
before a radiation treatment. If possible, cover treated skin (with
light clothing) before going outside. Ask your doctor if you should
use a sunscreen or a sunblocking product. If so, select one with a protection
factor of at least 15 and reapply it often. Ask your doctor or nurse
how long after your treatments are completed you should continue to
protect the treated skin from sunlight.
- If you have questions, ask your doctor or nurse. They are the only ones
who can properly advise you about your treatment, its side effects, home
care, and any other medical concerns you may have.
Your doctor may decide that a high dose of radiation given to a small area of
your body is the best way to treat your cancer. Internal radiation therapy allows
the doctor to give a higher total dose of radiation in a shorter time than is
possible with external treatment.
radiation therapy places the radiation source as close as possible to the cancer
cells. Instead of using a large radiation machine, the radioactive material,
sealed in a thin wire, catheter, or tube (implant), is placed directly into
the affected tissue. This method of treatment concentrates the radiation on
the cancer cells and lessens radiation damage to some of the normal tissue
near the cancer. Some of the radioactive substances used for internal radiation
treatment include cesium, iridium, iodine, phosphorus, and palladium.
Internal radiation therapy may be used for cancers of the head and neck, breast,
uterus, thyroid, cervix, and prostate. Your doctor may suggest using both internal
and external radiation therapy.
In this booklet, 'internal radiation treatment' refers to implant radiation.
Health professionals prefer to use the term "brachytherapy" for implant radiation therapy. You may hear your doctor or nurse use the terms,
interstitial radiation or intracavitary radiation; each is a form of internal
radiation therapy. Sometimes radioactive implants are called "capsules" or "seeds."
The type of implant and the method of placing it depend on the size and
location of the cancer. Implants may be put right into the tumor (interstitial
radiation), in special applicators inside a body cavity (intracavitary radiation)
or passage (intraluminal radiation), on the surface of a tumor, or in the area
from which the tumor has been removed. Implants may be removed after a short
time or left in place permanently. If they are to be left in place, the radioactive
substance used will lose radiation quickly and become non-radioactive in a
When interstitial radiation is given, the radiation source is placed in the tumor
in catheters, seeds, or capsules. When intracavitary radiation is used, a container
or applicator of radioactive material is placed in a body cavity such as the
uterus. In surface brachytherapy the radioactive source is sealed in a small
holder and placed in or against the tumor. In intraluminal brachytherapy the
radioactive source is placed in a body lumen or tube, such as the bronchus
Internal radiation also may be given by injecting a solution of radioactive substance
into the bloodstream or a body cavity. This form of radiation therapy may be
called unsealed internal radiation therapy.
For most types of implants, you will need to be in the hospital. You will be
given general or local anesthesia so that you will not feel any pain when the
doctor places the holder for the radioactive material in your body. In many
hospitals, the radioactive material is placed in its holder or applicator after
you return to your room so that other patients, staff, and visitors are not
exposed to radiation.
Sometimes the radiation source in your implant sends its high energy rays
outside your body. To protect others while you are having implant therapy,
the hospital will have you stay in a private room. Although the nurses and
other people caring for you will not be able to spend a long time in your room,
they will give you all of the care you need. You should call for a nurse when
you need one, but keep in mind that the nurse will work quickly and speak to
you from the doorway more often than from your bedside. In most cases, your
urine and stool will contain no radioactivity unless you are having unsealed
internal radiation therapy.
There also will be limits on visitors while your implant is in place. Children
younger than 18 or pregnant women should not visit patients who are having
internal radiation therapy. Be sure to tell your visitors to ask the hospital
staff for any special instructions before they come into your room. Visitors
should sit at least 6 feet from your bed and the radiation oncology staff will
determine how long your visitors may stay. The time can vary from 30 minutes
to several hours per day. In some hospitals a rolling lead shield is placed
beside the bed and kept between the patient and visitors or staff members.
The side effects of implant therapy depend on the area being treated.
You are not likely to have severe pain or feel ill during implant therapy.
However, if an applicator is holding your implant in place, it may be somewhat
uncomfortable. If you need it, the doctor will order medicine to help you relax
or to relieve pain. If general anesthesia was used while your implant was put
in place, you may feel drowsy, weak, or nauseated but these effects do not
last long. If necessary, medications can be ordered to relieve nausea.
Be sure to tell the nurse about any symptoms that concern you. In the Managing
Side Effects section you will find tips on how to deal with problems that might
occur after implant therapy.
Your doctor will decide the amount of time that an implant is to be left
in place. It depends on the dose (amount) of radioactivity needed for effective
treatment. Your treatment schedule will depend on the type of cancer, where
it is located, your general health, and other cancer treatments you have had.
Depending on where the implant is placed, you may have to keep it from shifting
by staying in bed and lying fairly still.
Temporary implants may be either low dose-rate (LDR) or high dose-rate (HDR).
Low dose-rate implants are left in place for several days; high dose-rate implants
are removed after a few minutes.
For some cancer sites, the implant is left in place permanently. If your implant
is permanent, you may need to stay in your hospital room away from other people
for a few days while the radiation is most active. The implant becomes less
radioactive each day; by the time you are ready to go home, the radiation in
your body will be much weaker. Your doctor will advise you if there are any
special precautions you need to use at home.
Usually, an anesthetic is not needed when the doctor removes a temporary
implant. Most can be taken out right in the patient's hospital room. Once the
implant is removed, there is no radioactivity in your body. The hospital staff
and your visitors will no longer have to limit the time they stay with you.
Your doctor will tell you if you need to limit your activities after you leave
the hospital. Most patients are allowed to do as much as they feel like doing.
You may need some extra sleep or rest breaks during your days at home, but
you should feel stronger quickly.
The area that has been treated with an implant may be sore or sensitive for some
time. If any particular activity such as sports or sexual intercourse cause
irritation in the treatment area, your doctor may suggest that you limit these
activities for a while.
|In remote brachytherapy, a computer sends the radioactive
source through a tube to a catheter that has been placed near the tumor
by the patient's doctor. The procedure is directed by the brachytherapy
team who watch the patient on closed-circuit television and communicate
with the patient using an intercom. The radioactivity remains at the
tumor for only a few minutes. In some cases, several remote treatments
may be required and the catheter may stay in place between treatments.
Remote brachytherapy may be used for low dose-rate (LDR) treatments in an inpatient
setting. High dose-rate (HDR) remote brachytherapy allows a person
to have internal radiation therapy in an outpatient setting. High dose-rate
treatments take only a few minutes. Because no radioactive material
is left in the body, the patient can return home after the treatment.
Remote brachytherapy has been used to treat cancers of the cervix,
breast, lung, pancreas, prostate, and esophagus.
The side effects of radiation treatment vary from patient to patient.
You may have no side effects or only a few mild ones through your course of
treatment. Some people do experience serious side effects, however. The side
effects that you have depend mostly on the radiation dose and the part of your
body that is treated. Your general health also can affect how your body reacts
to radiation therapy and whether you have side effects. Before beginning your
treatment, your doctor and nurse will discuss the side effects you might experience,
how long they might last, and how serious they might be.
Side effects may be acute or chronic. Acute side effects are sometimes
referred to as "early side effects." They occur soon after the treatment begins and usually are gone within a few
weeks of finishing therapy. Chronic side effects, sometimes called "late side effects," may take months or years to develop and usually are permanent.
The most common early side effects of radiation therapy are fatigue and
skin changes. They can result from radiation to any treatment site. Other side
effects are related to treatment of specific areas. For example, temporary
or permanent hair loss may be a side effect of radiation treatment to the head.
Appetite can be altered if treatment affects the mouth, stomach, or intestine.
This chapter discusses common side effects first. Then the side effects that
involve specific areas of the body are described.
Fortunately, most side effects will go away in time. In the meantime,
there are ways to reduce discomfort. If you have a side effect that is especially
severe, the doctor may prescribe a break in your treatments or change your
treatment in some way.
Be sure to tell your doctor, nurse, or radiation therapist about any side
effects that you notice. They can help you treat the problems and tell you
how to lessen the chances that the side effects will come back. The information
discussed here can serve as a guide to handling some side effects, but it cannot
take the place of talking with the members of your health care team.
Not necessarily. It will depend on which side effects you have and how severe
they are. Many patients are able to work, prepare meals, and enjoy their usual
leisure activities while they are having radiation therapy. Others find that
they need more rest than usual and therefore cannot do as much. Try to continue
doing the things you enjoy as long as you don't become too tired.
doctor may suggest that you limit activities that might irritate the area being
treated. In most cases, you can have sexual relations if you wish. You may
find that your desire for physical intimacy is lower because radiation therapy
may cause you to feel more tired than usual. For most patients, these feelings
Fatigue, feeling tired and lacking energy, is the most common symptom reported
by cancer patients. The exact cause is not always known. It may be due to the
disease itself or to treatment. It may also result from lowered blood counts,
lack of sleep, pain, and poor appetite.
people begin to feel tired after a few weeks of radiation therapy. During radiation
therapy, the body uses a lot of energy for healing. You also may be tired because
of stress related to your illness, daily trips for treatment, and the effects
of radiation on normal cells. Feelings of weakness or weariness will go away
gradually after your treatment has been completed.
You can help yourself during radiation therapy by not trying to do too much.
If you do feel tired, limit your activities and use your leisure time in a
restful way. Save your energy for doing the things that you feel are most important.
Do not feel that you have to do everything you normally do. Try to get more
sleep at night, and plan your day so that you have time to rest if you need
it. Several short naps or breaks may be more helpful than a long rest period.
Sometimes, light exercise such as walking may combat fatigue. Talk with your
doctor or nurse about how much exercise you may do while you are having therapy.
Talking with other cancer patients in a support group may also help you learn
how to deal with fatigue.
If you have a full-time job, you may want to try to continue to work your normal
schedule. However, some patients prefer to take time off while they're receiving
radiation therapy; others work a reduced number of hours. Speak frankly with
your employer about your needs and wishes during this time. A part-time schedule
may be possible or perhaps you can do some work at home. Ask your doctor's
office or the radiation therapy department to help by trying to schedule treatments
with your workday in mind.
Whether you're going to work or not, it's a good idea to ask family members or
friends to help with daily chores, shopping, child care, housework, or driving.
Neighbors may be able to help by picking up groceries for you when they do
their own shopping. You also could ask someone to drive you to and from your
treatment visits to help conserve your energy.
You may notice that your skin in the treatment area is red or irritated. It may
look as if it is sunburned, or tanned. After a few weeks your skin may be very
dry from the therapy. Ask your doctor or nurse for advice on how to relieve itching
some kinds of radiation therapy, treated skin may develop a "moist reaction," especially in areas where there are skin folds. When this happens, the skin
is wet and it may become very sore. It's important to notify your doctor or
nurse if your skin develops a moist reaction. They can give you suggestions
on how to care for these areas and prevent them from becoming infected.
During radiation therapy you will need to be very gentle with the skin in the
treatment area. The following suggestions may be helpful:
- Avoid irritating treated skin.
- When you wash, use only lukewarm water and mild soap; pat dry.
- Do not wear tight clothing over the area.
- Do not rub, scrub, or scratch the skin in the treatment area.
- Avoid putting anything that is hot or cold, such as heating pads or ice packs,
on your treated skin.
- Ask your doctor or nurse to recommend skin care products that will not cause
skin irritation. Do not use any powders, creams, perfumes, deodorants, body
oils, ointments, lotions, or home remedies in the treatment area while you're
being treated and for several weeks afterward unless approved by your doctor
- Do not apply any skin lotions within 2 hours of a treatment.
- Avoid exposing the radiated area to the sun during treatment. If you expect to
be in the sun for more than a few minutes you will need to be very careful.
Wear protective clothing (such as a hat with a broad brim and a shirt with
long sleeves) and use a sunscreen. Ask your doctor or nurse about using sunblocking
lotions. After your treatment is over, ask your doctor or nurse how long
you should continue to take extra precautions in the sun.
The majority of skin reactions to radiation therapy go away a few weeks
after treatment is completed. In some cases, though, the treated skin will
remain slightly darker than it was before and it may continue to be more sensitive
to sun exposure.
Radiation therapy can cause hair loss, also known as alopecia, but only
in the area being treated. For example, if you are receiving treatment to your
hip, you will not lose the hair from your head. Radiation of your head may
cause you to lose some or all of the hair on your scalp. Many patients find
that their hair grows back again after the treatments are finished. The amount
of hair that grows back will depend on how much and what kind of radiation
you receive. You may notice that your hair has a slightly different texture
or color when it grows back. Other types of cancer treatment, such as chemotherapy,
also can affect how your hair grows back.
Although your scalp may be tender after the hair is lost, it's a good idea to
cover your head with a hat, turban, or scarf. You should wear a protective
cap or scarf when you're in the sun or outdoors in cold weather. If you prefer
a wig or toupee, be sure the lining does not irritate your scalp. The cost
of a hairpiece that you need because of cancer treatment is a tax-deductible
expense and may be covered in part by your health insurance. If you plan to
buy a wig, it's a good idea to select it early in your treatment if you want
to match the color and style to your own hair.
Radiation therapy can cause low levels of white blood cells and platelets.
These blood cells normally help your body fight infection and prevent bleeding.
If large areas of active bone marrow are treated, your red blood cell count
may be low as well. If your blood tests show these side effects, your doctor
may wait until your blood counts increase to continue treatments. Your doctor
will check your blood counts regularly and change your treatment schedule if
it is necessary.
Sometimes radiation treatment causes loss of appetite and interferes with eating,
digesting, and absorbing food. Try to eat enough to help damaged tissues rebuild
themselves. It is not unusual to lose 1 or 2 pounds a week during radiation therapy.
You will be weighed weekly to monitor your weight.
is very important to eat a balanced diet. You may find it helpful to eat small
meals often and to try to eat a variety of different foods. Your doctor or
nurse can tell you whether you should eat a special diet, and a dietitian will
have some ideas that will help you maintain your weight.
Coping with short-term diet problems may be easier than you expect. There are
a number of diet guides and recipe booklets for patients who need help with
eating problems. A National Cancer Institute booklet, Eating Hints for Cancer
Patients explains how to get more calories and protein without eating more
food. It also has many tips that should help you enjoy eating. The recipes
it contains can be used for the whole family and are marked for people with
special concerns, such as low-salt diets.
If it's painful to chew and swallow, your doctor may advise you to use a powdered
or liquid diet supplement. Many of these products are available at drugstores
and supermarkets and come in a variety of flavors. They are tasty when used
alone or combined with other foods such as pureed fruit, or added to milkshakes.
Some of the companies that make these diet supplements have recipe booklets
to help you increase your nutrient intake. Ask your nurse, dietitian, or pharmacist
for further information.
You may lose interest in food during your treatment. Fatigue from your treatments
can cause loss of appetite. Some people just don't feel like eating because
of stress from their illness and treatment or because the treatment changes
the way food tastes. Even if you're not very hungry, it's important to keep
your protein and calorie intake high. Doctors have found that patients who
eat well can better cope with having cancer and with the side effects of treatment.
Medications for appetite enhancement are now available; ask your doctor or
nurse about them.
The list below suggests ways to perk up your appetite when it's poor and to make
the most of it when you do feel like eating.
- Eat when you are hungry, even if it is not mealtime.
- Eat several small meals during the day rather than three large ones.
- Use soft lighting, quiet music, brightly colored table settings, or whatever
helps you feel good while eating.
- Vary your diet and try new recipes. If you enjoy company while eating,
try to have meals with family or friends. It may be helpful to have the
radio or television on while you eat.
- Ask your doctor or nurse whether you can have a glass of wine or beer
with your meal to increase your appetite. Keep in mind that, in some cases,
alcohol may not be allowed because it could worsen the side effects of treatment.
This may be especially true if you are receiving radiation therapy for cancer
of the head, neck, or upper chest area including the esophagus.
- Keep simple meals in the freezer to use when you feel hungry.
- If other people offer to cook for you, let them. Don't be shy about telling
them what you'd like to eat.
- Keep healthy snacks close by for nibbling when you get the urge.
- If you live alone, you might want to arrange for "Meals on Wheels" to
bring food to you. Ask your doctor, nurse, social worker, or local social
service agencies about "Meals on Wheels." This service is available in most
If you are able to eat only small amounts of food, you can increase the
calories per serving by:
- Adding butter or margarine.
- Mixing canned cream soups with milk or half-and-half rather than water.
- Drinking eggnog, milkshakes, or prepared liquid supplements between meals.
- Adding cream sauce or melted cheese to your favorite vegetables.
Some people find they can drink large amounts of liquids even when they
don't feel like eating solid foods. If this is the case for you, try to get
the most from each glassful by making drinks enriched with powdered milk, yogurt,
honey, or prepared liquid supplements.
Nearly all patients being treated for cancer report feeling emotionally upset
at different times during their therapy. It's not unusual to feel anxious, depressed,
afraid, angry, frustrated, alone, or helpless. Radiation therapy may affect your
emotions indirectly through fatigue or changes in hormone balance, but the treatment
itself is not a direct cause of mental distress.
may find that it's helpful to talk about your feelings with a close friend,
family member, chaplain, nurse, social worker, or psychologist with whom you
feel at ease. You may want to ask your doctor or nurse about meditation or
relaxation exercises that might help you unwind and feel calmer.
Nationwide support programs can help cancer patients to meet others who share
common problems and concerns. Some medical centers have formed peer support
groups so that patients can meet to discuss their feelings and inspire each
There are several helpful books, tapes, and videos on dealing with the emotional
effects of having cancer. You may find that the National Cancer Institute publication,
Taking Time, is a good resource for this kind of information.
Some people who receive radiation to the head and neck experience redness,
irritation, and sores in the mouth; a dry mouth or thickened saliva; difficulty
in swallowing; changes in taste; or nausea. Try not to let these symptoms keep
you from eating.
Other problems that may occur during treatment to the head and neck are a loss
of taste, which may diminish appetite and affect nutrition, and earaches (caused
by hardening of ear wax). You may notice some swelling or drooping of the skin
under your chin as well as changes in the skin texture. Your jaw may also feel
stiff and you may be unable to open your mouth as wide as before treatment.
Jaw exercises may help ease this problem. Report all side effects to your doctor
or nurse and ask what you should do about them.
If you are receiving radiation therapy to the head or neck, you need to take
especially good care of your teeth, gums, mouth, and throat. Side effects from
treatment to these areas commonly involve the mouth, which may be sore and
dry. Here are a few tips that may help you manage mouth problems:
- Avoid spices and coarse foods such as raw vegetables, dry crackers, and
- Remember that acidic foods and liquids can cause mouth and throat irritation.
- Don't smoke, chew tobacco, or drink alcohol.
- Stay away from sugary snacks because they can promote tooth decay.
- Clean your mouth and teeth often, using the method your dentist or doctor
- Use only alcohol-free mouthwash; many commercial mouthwashes contain alcohol
which has a drying effect on mouth tissues.
Radiation treatment for head and neck cancer can increase your chances of getting
cavities in your teeth. Mouth care designed to prevent problems will be a
very important part of your treatment. Before starting radiation therapy,
make an appointment for a complete dental/oral checkup. Ask your dentist
and radiation oncologist to consult before your radiation treatments begin.
dentist probably will want to see you often during your radiation therapy to
help you care for your mouth and teeth. This is a good way to reduce the risk
of tooth decay and help you deal with possible problems such as soreness of
the tissues in your mouth. It's important that you follow the dentist's advice
while you're receiving radiation therapy. Most likely, your dentist will suggest
- Clean your teeth and gums thoroughly with a soft brush at least 4 times
a day (after meals and at bedtime).
- Use a fluoride toothpaste that contains no abrasives.
- Floss gently between teeth daily if you flossed regularly before your
illness. Use waxed, non-shredding dental floss.
- Rinse your mouth gently and frequently with a salt and baking soda solution
especially after you brush. Use 1/2 teaspoon of salt and 1/2 teaspoon of
baking soda in a large glass of warm water. Follow with a plain water rinse.
- Apply fluoride regularly as prescribed by your dentist.
Your dentist can explain how to mix the salt and baking soda mouthwash
and how to use the fluoride treatment method that best suits your needs. You
can probably get printed instructions for proper dental care at the dentist's
office. If dry mouth continues after your treatment is complete, you will need
to continue the mouth care recommended during treatment. Always share your
dentist's instructions with your radiation nurse.
Dealing with Mouth or Throat Problems
Soreness in your mouth or throat may appear in the second or third week of
external radiation therapy and it will most likely have disappeared within
a month or so after your treatments have ended. You may have trouble swallowing
during this time because your mouth feels dry. Your doctor or dentist can
prescribe medicine for mouth discomfort and tell you about methods to relieve
other mouth problems during and following your radiation therapy. If you
wear dentures you may notice that they no longer fit well. This occurs if
the radiation causes your gums to swell. You may need to stop wearing your
dentures until your radiation therapy is over. It's important not to risk
denture-induced gum sores because they may become infected and heal slowly.
salivary glands may produce less saliva than usual, making your mouth feel
dry. Unfortunately dry mouth may continue to be a problem even after treatment
is over. You may be given medication to help lessen this side effect. It's
helpful to sip cool drinks throughout the day. Although many radiation therapy
patients have said that drinking carbonated beverages helps relieve dry mouth,
water probably is your best choice. In the morning, fill a large container
with ice, add water, and carry it with you during the day so that you can take
frequent sips. Keep a glass of cool water at your bedside at night, too. Sugar-free
candy or gum also may help; be careful about overuse of these products as they
can cause diarrhea in some people. Avoid tobacco and alcoholic drinks because
they tend to dry and irritate your mouth tissues. Moisten food with gravies
and sauces to make eating easier. If these measures are not enough, ask your
dentist, radiation oncologist, or nurse about products that either replace or stimulate your own saliva. Artificial saliva and medication
to increase saliva production are available.
Tips on Eating
You may find that it's difficult or painful to swallow. Some patients say that
they feel as if something is stuck in their throat. Soreness or dryness in
your mouth or throat can also make it hard to eat. The section on eating
problems may be helpful. In addition, some of the following tips may help
to make eating more comfortable:
- Choose foods that taste good to you and are easy to eat.
- Try changing the consistency of foods by adding fluids and using sauces
and gravies to make them softer.
- Avoid highly spiced foods and textures that are dry and rough, such as
- Eat small meals, and eat more frequently than usual.
- Cut your food into small, bite-sized pieces.
- Ask your doctor for special liquid medicines to reduce the pain in your
throat so that you can eat and swallow more easily.
- Ask your doctor about liquid food supplements that are easier to swallow
than solids. They can help you get enough calories each day to avoid losing
- If you are being treated for lung cancer, it's important to keep mucus
and other secretions thin and manageable; drinking extra fluids can help.
- If familiar foods no longer taste good, try new foods and use different
methods of food preparation.
Radiation treatment to the chest may cause several changes. For example, you
may find that it is hard to swallow or that swallowing hurts. You may develop
a cough or a fever. You may notice that when you cough the amount and color of
the mucus is different. Shortness of breath is also common. Be sure to let your
treatment team know right away if you have any of these symptoms. Remember that
your doctor and nurse have seen these changes in many radiation patients and
they know how to help you deal with them.
The most common side effects with radiation therapy for breast cancer are fatigue
and skin changes. However there may be other side effects as well. If you notice
that your shoulder feels stiff, ask your doctor or nurse about exercises to keep
your arm moving freely. Other side effects include breast or nipple soreness,
swelling from fluid buildup in the treated area, and skin reddening or tanning.
Except for tanning which may take up to 6 months to fade, these side effects
will most likely disappear in 4 to 6 weeks.
you are being treated for breast cancer and you are having radiation therapy
after a lumpectomy or mastectomy, it's a good idea to go without your bra whenever
possible or, if this makes you more uncomfortable, wear a soft cotton bra without
underwires. This will help reduce skin irritation in the treatment area.
Radiation therapy after a lumpectomy may cause additional changes in the treated
breast after therapy is complete. These long-term side effects may continue
for a year or longer after treatment. The skin redness will fade, leaving your
skin slightly darker, just as when a sunburn fades to a sun tan. The pores
in the skin of your breast may be enlarged and more noticeable. Some women
report increased sensitivity of the skin on the breast; others have decreased
feeling. The skin and the fatty tissue of the breast may feel thicker and firmer
than it was before your radiation treatment. Sometimes the size of your breast
changes--it may become larger because of fluid buildup or smaller because of
the development of scar tissue. Many women have little or no change in size.
Your radiation therapy plan may include temporary implants of radioactive material
in the area around your lumpectomy. A week or two after external treatment
is completed, these implants are inserted during a short hospitalization. The
implants may cause breast tenderness or a feeling of tightness. After they
are removed, you are likely to notice some of the same effects that occur with
external treatment. If so, let your doctor or nurse know about any problems
Most changes resulting from radiation therapy for breast cancer are seen within
10 to 12 months after completing therapy. Occasionally small red areas called
telangiectasias appear. These are areas of dilated blood vessels and the color
may fade with time. If you see new changes in breast size, shape, appearance,
or texture after this time, report them to your doctor at once.
If you are having radiation treatment to the stomach or some portion of the abdomen,
you may have an upset stomach, nausea, or diarrhea. Your doctor can prescribe
medicines to relieve these problems. Do not take any medications for these symptoms
unless you first check with your doctor or nurse.
It's not unusual to feel queasy for a few hours right after radiation treatment
to the stomach or abdomen. Some patients find that they have less nausea if
they have their treatment with an empty stomach. Others report that eating
a light meal 1 to 2 hours before treatment lessens queasiness. You may find
that nausea is less of a problem if you wait 1 to 2 hours after your treatment
before you eat. If this problem persists, ask your doctor to prescribe a medicine
(an antiemetic to prevent nausea. If antiemetics are prescribed, take them
within the hour before treatment or when your doctor or nurse suggests, even
if you sometimes feel that they are not needed.
your stomach feels upset just before every treatment, the queasiness or nausea
may be caused by anxiety and concerns about cancer treatment. Try having a
bland snack such as toast or crackers and apple juice before your appointment.
It may also help to try to unwind before your treatment. Reading a book, writing
a letter, or working a crossword puzzle may help you relax.
Here are some other tips to help an unsettled stomach:
- Stick to any special diet that your doctor, nurse, or dietitian
- Eat small meals.
- Eat often and try to eat and drink slowly.
- Avoid foods that are fried or are high in fat.
- Drink cool liquids between meals.
- Eat foods that have only a mild aroma and can be served cool or at room temperature.
For severe nausea and vomiting, try a clear liquid diet (broth and clear
juices) or bland foods that are easy to digest, such as dry toast and gelatin.
What to Do About Diarrhea
Diarrhea may begin in the third or fourth week of radiation therapy to the
abdomen or pelvis. You may be able to prevent diarrhea by eating a low fiber
diet when you start therapy: avoid foods such as raw fruits and vegetables,
beans, cabbage, and whole grain breads and cereals. Your doctor or nurse
may suggest other changes to your diet, prescribe antidiarrhea medicine,
or give you special instructions to help with the problem. Tell the doctor
or nurse if these changes fail to control your diarrhea. The following changes
in your diet may help:
- Try a clear liquid diet (water, weak tea, apple juice, clear broth, plain
gelatin) as soon as diarrhea starts or when you feel that it's going to
- Ask your doctor or nurse to advise you about liquids that won't make your
diarrhea worse. Weak tea and clear broth are frequent suggestions.
- Avoid foods that are high in fiber or can cause cramps or a gassy feeling
such as raw fruits and vegetables, coffee and other beverages that contain
caffeine, beans, cabbage, whole grain breads and cereals, sweets, and spicy
- Eat frequent small meals.
- If milk and milk products irritate your digestive system, avoid them or
use lactose-free dairy products.
- Continue a diet that is low in fat and fiber and lactose-free for 2 weeks
after you have finished your radiation therapy. Gradually re-introduce other
foods. You may want to start with small amounts of low-fiber foods such
as rice, bananas, applesauce, mashed potatoes, low-fat cottage cheese, and
- Be sure your diet includes foods that are high in potassium (bananas,
potatoes, apricots), an important mineral that you may lose through diarrhea.
Diet planning is very important for patients who are having radiation
treatment of the stomach and abdomen. Try to pack the highest possible food
value into every meal and snack so that you will be eating enough calories
and vital nutrients. Remember that nausea, vomiting, and diarrhea are likely
to disappear once your treatment is over.
If you are having radiation therapy to any part of the pelvis (the area between
your hips), you might have some of the digestive problems already described.
You also may have bladder irritation which can cause discomfort or frequent urination.
Drinking a lot of fluid can help relieve some of this discomfort. Avoid caffeine
and carbonated beverages. Your doctor also can prescribe some medicine to help
relieve these problems.
effects of radiation therapy on sexual and reproductive functions depend on
which organs are in the radiation treatment area. Some of the more common side
effects do not last long after treatment is finished. Others may be long-term
or permanent. Before your treatment begins, ask your doctor about possible
side effects and how long they might last.
Depending on the radiation dose, women having radiation therapy in the pelvic
area may stop menstruating and have other symptoms of menopause such as vaginal
itching, burning, and dryness. You should report these symptoms to your doctor
or nurse, who can suggest treatment.
Effects on Fertility
Scientists are still studying how radiation treatment affects fertility. If
you are a woman in your childbearing years, it's important to discuss birth
control and fertility issues with your doctor. You should not become pregnant
during radiation therapy because radiation treatment during pregnancy may
injure the fetus, especially in the first three months. If you are pregnant
before your therapy begins, be sure to tell your doctor so that the fetus
can be protected from radiation, if possible.
therapy to the area that includes the testes can reduce both the number of
sperm and their effectiveness. This does not mean that conception cannot occur,
however. Ask your doctor or nurse about effective measures to prevent pregnancy
while you are having radiation. If you have any concerns about fertility, be
sure to discuss them with your doctor. For example, if you want to have children,
you may be concerned about reduced fertility after your cancer treatment is
completed. Your doctor can help you get information about the option of banking
your sperm before treatment.
With most types of radiation therapy, neither men nor women are likely to notice
any change in their ability to enjoy sex. Both sexes, however, may notice a decrease
in their level of desire. This is more likely to be due to the stress of having
cancer than to the effects of radiation therapy. Once the treatment ends, sexual
desire is likely to return to previous levels.
radiation treatment to the pelvis, some women are advised not to have intercourse.
Others may find that intercourse is uncomfortable or painful. Within a few
weeks after treatment ends, these symptoms usually disappear. If shrinking
of vaginal tissues occurs as a side effect of radiation therapy, your doctor
or nurse can explain how to use a dilator, a device that gently stretches the
tissues of the vagina.
If you have questions or concerns about sexual activity during and after cancer
treatment, discuss them with your nurse or doctor. Ask them to recommend booklets
that may be helpful.
Once you have completed your radiation treatments, it is important for
your doctor to monitor the results of your therapy at regularly scheduled visits.
These checkups are necessary to deal with radiation side effects and to detect
any signs of recurrent disease. During these checkups your doctor will examine
you and may order some lab tests and x-rays. The radiation oncologist also
will want to see you for followup after your treatment ends and will coordinate
followup care with your doctor.
Followup care might include more cancer treatment, rehabilitation, and counseling.
Taking good care of yourself is also an important part of following through
after radiation treatments.
Most patients return to the radiation oncologist for regular follow-up
visits. Others are referred to their original doctor, to a surgeon, or to a
medical oncologist. Your followup care will depend on the kind of cancer that
was treated and on other treatments that you had or may need.
Just as every patient is different, followup care varies. Your doctor
will prescribe and schedule the followup care that you need. Don't hesitate
to ask about the tests or treatments that your doctor orders. Try to learn
all the things you need to do to take good care of yourself.
Following are some questions that you may want to ask your doctor after you have
finished your radiation therapy:
- How often do I need to return for checkups?
- Why do I need more x-rays, CT-scans, blood tests, and so on? What will
these tests tell us?
- Will I need chemotherapy, surgery, or other treatments?
- How and when will you know if I'm cured of cancer?
- What are the chances that it will come back?
- How soon can I go back to my regular activities? Work? Sexual activity?
- Do I need to take any special precautions like staying out of the sun
or avoiding people with infectious diseases?
- Do I need a special diet?
- Should I exercise?
- Can I wear a prosthesis?
- Can I have reconstructive surgery ? How soon can I schedule it?
It's a good idea to write down the questions you want to ask your doctor
and take them with you when you have your appointment with the doctor. Some
patients find that it's helpful to take a family member with them to help remember
what the doctor says.
Radiation therapy is not painful. However, some radiation side effects
may cause discomfort. In addition, when radiation is used for palliation some
discomfort or pain may remain. Sometimes patients need help to manage cancer
pain. Over-the-counter pain medicine may be enough for mild pain. Remember
that you should not use a heating pad or a warm compress to relieve pain in
any area treated with radiation.
If your pain is severe, ask the doctor about prescription drugs or other methods
of relief. Try to be specific about your pain (how severe is it on a scale
of 0-10 where 0 is no pain and 10 is the worst pain you can imagine? where
is your pain? is the pain throbbing, stabbing, searing? is it continuous or
intermittent? what makes it better or worse?) when you tell the doctor about
it so you can get the best pain management. If you are unable to get pain relief,
you may want to ask your doctor for a referral to a pain specialist.
Because fear and worry can make pain worse, you may find that relaxation exercises
are helpful. Other methods such as hypnosis, biofeedback, and acupuncture may
be useful for some cancer pain. Be sure to discuss these complementary or alternative
treatments with your doctor or nurse. Sometimes complementary therapies can
interfere with other treatment you are having. They can also be harmful when
combined with other treatment.
Patients who have had radiation therapy need to continue some of the special
care they used during treatment, at least for a short while. For instance,
you may have skin problems for several weeks after your treatments end. Continue
to be gentle with skin in the treatment area until all signs of irritation
are gone. Don't try to scrub off the marks in your treatment area. If tattoos
were used to mark the treatment area, they are permanent and will not wash
off. Your nurse can answer questions about skin care and help you with other
concerns you may have after your treatment has been completed.
You may find that you still need extra rest after your therapy is over while
your healthy tissues are recovering and rebuilding. Keep taking naps as needed
and try to get more sleep at night. It may take some time to get your strength
back, so resume your normal schedule of activities gradually. If you feel that
you need emotional or social support, ask your doctor, nurse, or a social worker
for information about support groups or other ways to express your feelings
After treatment for cancer, you're likely to be more aware of your body
and to notice even slight changes in how you feel from day to day. The doctor
will want to know if you are having any unusual symptoms. Promptly tell your
- A pain that doesn't go away, especially if it's always in the same
- New or unusual lumps, bumps, or swelling.
- Nausea, vomiting, diarrhea, or loss of appetite.
- Unexplained weight loss.
- A fever or cough that doesn't go away.
- Unusual rashes, bruises, or bleeding.
- Any symptoms that you are concerned about.
- Any other warning signs mentioned by your doctor or nurse.
Many people find that they can continue to work during radiation therapy
because treatment appointments are short. If you have stopped working, you
can return to your job as soon as you feel up to it. If your job requires lifting
or heavy physical activity, you may need a change in your work responsibilities
until you have regained your strength. Check with your employer to see if a
'return to work' release from your doctor is required.
When you are ready to return to work, it is important to learn about your rights
regarding your job and health insurance. If you have any questions about employment
issues, contact the Cancer Information Service (CIS) by calling 1-800-4-CANCER
or online at Cancer.gov. CIS staff can help you find local agencies that can
help you deal with problems regarding employment and insurance rights that
are sometimes faced by cancer survivors.
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Acute Radiation Enteritis
Radiation therapy mainly affects rapidly dividing cells, such as
the cells lining the large and small bowel. An increasing number of cells die,
and this leads to other problems over the next few days and weeks. Patients
with acute enteritis may complain of nausea, vomiting, abdominal cramping,
the frequent urge to have a bowel movement, and watery diarrhea. With diarrhea,
the gastrointestinal tract does not function as efficiently, and fat, lactose,
bile salts, and vitamin B12 are not well absorbed. Symptoms of an inflamed
rectum, including a mucus-like discharge, rectal pain, and rectal bleeding,
may result from radiation damage to the anus or rectum.
Symptoms of acute enteritis usually get better 2 to 3 weeks after
Patients should be examined and asked questions about the following:
- Usual pattern of bowel movements.
- Pattern of diarrhea, including when it started; how
long it has lasted; frequency, amount, and type of stools; and other symptoms
(such as gas, cramping, bloating, urgency, bleeding, and rectal soreness).
- Nutrition of the patient, including height and weight,
usual eating habits, any change in eating habits, amount of fiber in the
diet, and signs of dehydration (such as poor skin tone, increased weakness,
- Current level of stress, coping ability, and changes
in lifestyle caused by the enteritis.
Treatment of acute enteritis includes treating the diarrhea, loss
of fluids, poor absorption, and stomach or rectal pain. These symptoms usually
get better with medications, changes in diet, and rest. If symptoms become
worse even with this treatment, then cancer treatment may have to be stopped,
at least temporarily.
Medication may be prescribed such as antidiarrheals to stop diarrhea,
narcotics to relieve pain, and steroid foams to relieve rectal inflammation
and irritation. If patients with pancreatic cancer have diarrhea during radiation
therapy, they may need pancreatic enzyme replacement, since not having enough
of these enzymes can cause diarrhea.
Nutrition also plays a role in acute enteritis. When intestines
are damaged by radiation therapy, production of enzymes, especially lactase,
decreases or stops entirely. Lactase is essential in the digestion of milk
and milk products. A lactose-free, low-fat, and low-fiber diet may help to
control symptoms of acute enteritis.
Recommended foods to avoid:
- Milk and milk products (except buttermilk and yogurt).
Processed cheese may be tolerated because the lactose is removed in processing.
Lactose-free milkshake supplements, such as Ensure, may also be used.
- Whole-bran bread and cereal.
- Nuts, seeds, and coconut.
- Fried, greasy, or fatty foods.
- Fresh and dried fruit and some fruit juices, such as
- Raw vegetables.
- Rich pastries.
- Popcorn, potato chips, and pretzels.
- Strong spices and herbs.
- Chocolate, coffee, tea, and soft drinks with caffeine.
- Alcohol and tobacco.
Foods that are recommended:
- Fish, poultry, and meat that is cooked, broiled, or roasted.
- Bananas, applesauce, peeled apples, and apple and grape
- White bread and toast.
- Macaroni and noodles.
- Baked, boiled, or mashed potatoes.
- Cooked vegetables that are mild, such as asparagus tips,
green and waxed beans, carrots, spinach, and squash.
- Mild processed cheese, eggs, smooth peanut butter, buttermilk,
- Eat food at room temperature.
- Drink 3 liters of fluid a day. Carbonated beverages should
be allowed to lose their carbonation before being consumed.
- Add nutmeg to food to help decrease movement of the gastrointestinal
- Start a low-fiber diet on the first day of radiation
Chronic Radiation Enteritis
Only 5% to 15% of the patients who receive radiation therapy to
the abdomen or pelvis will develop chronic radiation enteritis. Symptoms include
wave-like abdominal pain, bloody diarrhea, frequent urges to have a bowel movement,
greasy and fatty stools, weight loss, and nausea and vomiting. Less common
are bowel obstruction, holes in the bowel, and heavy rectal bleeding. Symptoms
usually appear 6 to 18 months following radiation therapy.
Before determining that chronic radiation enteritis is causing
these symptoms, recurrent tumors need to be ruled out. The radiation history
of the patient is important in making the correct diagnosis.
Symptoms of chronic radiation enteritis are treated in the same
way as symptoms of acute radiation enteritis. Surgery is used to treat severe
damage. Less than 2% of the affected patients will require surgery to control
Two types of surgery may be used: intestinal bypass or complete
removal of the diseased intestines. However, the patient's condition should
be considered before surgery is attempted, since wound healing is often slow
and may require long-term tube feeding. Even after surgery, many patients may
still have symptoms.
To minimize the risk of chronic radiation enteritis, health professionals
use different methods to try and reduce the area that is exposed to radiation.
Patients may be positioned to protect as much of the small bowel as possible
from the radiation treatment, or may be asked to have a full bladder during
treatment to help push the small bowel out of the way. The amount of radiation
may be adjusted to deliver lower amounts more evenly or higher amounts to specific
areas. If a patient has surgery, clips may be placed at the tumor site to help
designate the area to be irradiated.
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