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adiation
therapy is a treatment for cancer and, less commonly, thyroid disease, blood
disorders, and noncancerous growths.
A
doctor may recommend radiation for cancer at
different stages. In the early stages, radiation therapy can help reduce the
size of a tumor before surgery or kill remaining
cancer cells afterward. In the later stages, it may help relieve pain as part
of palliative care.
One form of radiation treatment involves
using a machine that produces a beam of radiation. The beam targets a specific
area of the body. Another type involves putting a radioactive substance inside
the body, either permanently or temporarily.
In this article, we focus mainly on radiation therapy as a cancer
treatment.
What is radiation therapy?
External beam radiation therapy is typically administered using a linear accelerator.
Radiation therapy uses waves of energy, such as light or heat, to treat
cancers and other tumors and conditions. The form of radiation used in cancer
therapy is a high-energy type known as ionizing radiation.
Scientists still do not know exactly how radiation works as a treatment
for cancer.
They do know, however, that it breaks up the DNA of cancer cells in a way
that disrupts their growth and division. In this way, radiation can kill cancer
cells, preventing or slowing the spread of the disease.
Sometimes a doctor prescribes radiation therapy alone, but usually, they
recommend it in combination with other treatments, such as chemotherapy, surgery, or both.
There are many types of cancer. Learn more here.
Side effects
Radiation can affect healthy cells as well as cancerous ones. When this
happens, a person experiences side effects.
Specific side effects depend on factors such as:
·
the
area receiving treatment
·
the
person's overall health
·
the
type and doses of radiation
Short term side
effects
Radiation used in medicine is dangerous only when precautions are not taken - if health workers do not shield themselves from repeated exposure, for example.
Short term side effects vary, depending on the part of the body receiving
radiation.
They can include:
·
fatigue
·
diarrhea
·
skin
changes
·
nausea
and vomiting
A 2018 study published
in BMJ Open recommends screening for anxiety and depression in people undergoing radiation
therapy and offering counseling services to those who may benefit from them.
Long term side
effects
Long term side effects also depend on the treatment site.
They include:
·
heart
or lung problems, if radiation affects the chest
·
thyroid
problems, leading to hormonal changes, if radiation affects the neck area
·
lymphedema,
which involves lymph fluid building up and causing pain
·
hormonal
changes, including a possibility of early menopause, from radiation in the pelvic area
There is a slight chance that high doses of radiation in certain areas can
increase the risk of another form of cancer developing. A doctor will provide
more specific information and help with weighing the risks and benefits.
Not everyone who has radiation therapy experiences long term side effects.
The risk depends on the doses, the area of treatment, and other individual
factors.
Radiation therapy and other
treatments
Radiation therapy is one of several cancer treatments. A doctor may
prescribe these separately or in combination.
As well as radiation, a person may have:
·
surgery
·
chemotherapy
·
hormone
therapy
·
targeted
therapy
The treatment plan will depend on the type of cancer, among other factors.
When a person receives radiation therapy and chemotherapy at the same
time, the doctor may call this "chemoradiation." It can lead to
severe adverse effects.
When cancer is at an early stage, a person may have radiation therapy
before surgery, to reduce the size of a tumor. Or, they may have it after
surgery to help remove any remaining cancerous cells.
Radiation is only effective in targeted areas. It is less effective when
cancer has spread to distant parts of the body.
How effective is chemotherapy? Find out here.
Types
There are two forms of
radiation therapy.
External beam
radiation therapy
This is the most common type. It involves an external machine emitting a
beam of radiation that targets the treatment area.
Different forms are available, depending on the need. High-energy beams,
for example, can target cancer that is deeper within the body.
Internal
radiation therapy
There are different types of
internal radiation therapy. Both involve implanting or introducing a
radioactive substance into the body.
Brachytherapy involves inserting a radioactive implant in or close to the
cancerous tissue. The implant may be temporary or permanent. Another type of
internal radiation therapy involves drinking or receiving an injection of
radioactive liquid.
The goal is to limit the extent to which healthy tissue around the cancer
is exposed to the radiation. Doctors may recommend this treatment for prostate
or ovarian cancer,
for example.
A doctor may recommend undergoing both main types of radiation therapy.
The decision will depend on:
·
the
type of cancer
·
the
size of the tumor
·
the
tumor's location, including the types of tissue nearby
·
the
person's age and overall health
·
other
treatments
Scientists continue to explore ways of improving radiation techniques to
achieve more effective outcomes with the least possible risk.
What to expect
The doctor will discuss radiation therapy and other options and help weigh
the pros and cons. Before treatment starts, they will determine the right type
and dosage of radiation.
A person receiving external beam radiation may undergo a CT or MRI scan before
treatment. This is to pinpoint the exact location and size of the tumor. A
doctor may make a permanent but small mark on the skin to ensure that the
radiation therapist will target the beam correctly.
A person may need to wear a plaster cast or use a headrest or another
device to ensure that they stay still during treatment. The first session may
be a simulation, in which the team runs through the procedure.
Many people have five sessions per
week for 3–9 weeks, but this depends on specific factors. Each session lasts
for around 15 minutes. Radiation therapy is painless, but there will be damage
to surrounding tissue. This is why the treatment occurs on only 5 days per
week. The 2-day break allows for some healing.
A person who has internal radiation therapy may require an anesthetic
before the doctor can implant the radioactive substance. Overall, several
sessions and some time in the hospital may be necessary.
The details of the process depend on the type of radiation therapy and the
type and location of the cancer.
Aftercare
After receiving external treatment, a person can go home and continue with
their daily routine.
However, they may experience:
·
tiredness
·
sensitivity
around the treatment site
·
emotional
distress
To help manage these effects, it is important to:
·
get
plenty of rest
·
eat
healthfully
·
talk
to friends and family about any side effects
·
follow
instructions, which may involve skin care, from the treatment team
·
avoid
spending time in the sun, due to a risk of photosensitivity
Also, monitor for adverse effects and tell the doctor if they occur. The
doctor may recommend additional treatments aimed at relieving these.
People may need to speak to their employers about adjusting work schedules
or taking medical leave.
Uses
Radiation therapy will be recommended by a doctor to target well-defined and contained cancers.
Radiation therapy can help shrink tumors and kill cancerous cells in the
early stages.
This kind of treatment, in combination with other appropriate therapies,
can cause cancer to go into remission. In many cases, it does not come back
again.
Radiation therapy can also help treat symptoms when cancer has spread
widely. At this point, the radiation is part of palliative care, which aims to
relieve a person's symptoms and improve their quality of life. It may also
extend a person's life, in some cases.
Palliative radiation treatment usually involves lower doses and fewer
treatment sessions than curative treatment.
In some people with bone cancer, for example, palliative radiation
treatment can help stop painful tumors from developing.
Other ways that palliative radiation treatment can help include:
·
relieving
pressure or a blockage by reducing tumor size
·
treating
symptoms of brain cancer, such as headaches, nausea, and dizziness
·
reducing
symptoms of lung cancer,
such as chest pain and breathlessness
·
controlling
ulcerating tumors, bleeding, and infections
In people with head and neck cancers, an obstruction in the superior vena
cava can affect the return of blood to the heart. Radiation therapy can help
relieve this.
Cancer is metastatic when it has spread to other parts of the body. Here, learn about metastatic breast cancer.
Outlook
Some people feel anxiety and concern about radiation therapy. It has
various uses in treating cancer, and it can help achieve complete remission, in
some cases.
The National Cancer
Institute (NCI) point out that radiation can be costly.
People with health insurance should
speak with their provider about coverage. Also, some organizations provide
financial support and other help to people who need treatment. The NCI provide
a list of options.
Discuss any concerns with the doctor and ask as many questions as
possible. Knowing what to expect can help.
Q:
Will my hair grow back after radiation therapy?
A:
Radiation therapy only causes hair loss at the site
receiving the therapy. Hair loss may be temporary or permanent, depending on
the site and the doses. Higher doses of radiation may be more likely to result
in permanent hair loss.
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