16500 Brachytherapy
Overview
Brachytherapy is a type of radiation treatment for cancer. It places a radioactive source inside your body, or very close to a tumor. This lets doctors give a high dose of radiation to the cancer while limiting radiation to nearby healthy tissue. The number 16500 may be a clinic or billing reference in your records, not a separate illness; ask your care team what it means for you. Brachytherapy is planned and given by a specialist cancer team.
Key facts
- Brachytherapy is also called internal radiation therapy.
- It can be temporary or permanent, depending on the type used.
- It is used for some cancers, such as prostate, cervical, uterine, breast, and skin cancers, and sometimes to relieve symptoms.
Brachytherapy is a common cancer treatment in many specialist centers. It is used for selected patients and selected cancers.
It can be offered to adults and, in special situations, to children at specialist centers. Suitability depends on the cancer type, its size and position, your general health, and your treatment goals.
Symptoms
- Call your local emergency number immediately if you have heavy bleeding that does not stop.
- Call your local emergency number immediately if you have a high fever with shaking chills or you feel very unwell.
- Call your local emergency number immediately if you cannot pass urine at all and have severe lower belly pain.
- Call your local emergency number immediately if you have chest pain, trouble breathing, fainting, or sudden confusion.
- ⚠Fever or signs of infection, such as redness, heat, swelling, or pus near a catheter or wound
- ⚠Painful urination, unable to pass urine, or blood in urine that worries you
- ⚠New heavy vaginal bleeding or bleeding that soaks pads
- ⚠Severe pain not controlled by the plan your team gave you
- ⚠Vomiting or diarrhea that will not stop, or signs of dehydration
- ⚠A catheter or implant that feels loose, moves, or comes out
Common symptoms
- Tiredness or low energy for a few days or weeks
- Skin changes near the treated area, such as redness, dryness, or soreness
- Bladder changes, such as needing to pass urine more often, burning, or urgency
- Bowel changes, such as looser stools, urgency, or needing to pass wind more often
- Vaginal discharge, light bleeding, or soreness after pelvic treatment
- Mild pain or discomfort in the treated area
- Temporary changes in sexual function or interest
Symptoms in children
- Brachytherapy is used less often in children and is done at specialist children's cancer centers.
- Children may need extra planning, anesthesia, and support to stay still during treatment.
- Side effects depend on the child's age, the cancer, and the part of the body treated.
Symptoms in older adults
- Older adults may have other health conditions, so the team checks heart, kidney, and bladder health before treatment.
- Side effects may need extra monitoring, especially urinary, bowel, and balance problems.
- The plan can often be adjusted to the person's needs and goals.
Causes
Main causes
- Brachytherapy is a treatment, not a disease, so it is not caused by anything.
- It is used when a cancer is in or near an area where an internal radiation dose can be placed safely.
- It may be used alone, after external beam radiation, or alongside surgery or other cancer treatments.
- It can also be used to shrink a tumor and ease symptoms when cure is not the goal.
Risk factors
- Factors your team considers include the type and stage of cancer, tumor size, and exact position.
- Previous radiation treatment to the same area can affect whether brachytherapy is safe.
- Pregnancy, bleeding problems, active infection, or trouble lying still may change the plan.
- Your general health, medicines, allergies, and personal preferences are part of the decision.
When to see a doctor
See a doctor urgently if:
- Call your cancer team or urgent care the same day for a fever, new severe pain, or signs of infection.
- Get same-day advice if you cannot pass urine, have heavy bleeding, or cannot keep fluids down.
- Ask for urgent review if a catheter, dressing, or implant feels loose or comes out.
- Seek same-day help for sudden swelling, new weakness, or any symptom that worries you.
Book a routine appointment if:
- Book a routine review if side effects are not settling or are affecting daily life.
- Ask about skin care, bowel or bladder changes, sexual health, and fertility questions.
- Talk to your team about tiredness, sleep, appetite, or emotional strain.
- Ask for help with work, travel, or practical support during treatment.
Diagnosis
Brachytherapy is not a diagnosis. It is planned after your cancer has been diagnosed and your team has reviewed your tests. A radiation oncologist, a cancer doctor who uses radiation, decides whether internal radiation is safe and useful for you. They explain the benefits, risks, and other options.
Tests that may be done
- Biopsy, where a small sample of tissue is checked for cancer
- Imaging scans such as CT, MRI, ultrasound, or PET to see the cancer and nearby organs
- Blood tests to check general health, kidney function, and blood counts
- A pregnancy test when relevant
- Planning scans done with a small catheter or markers in place
- An anesthesia review if you need sedation or a general anesthetic
What to expect at your appointment
You will usually have a planning appointment first. The team may place a thin tube, needle, or small markers near the cancer using numbing medicine or anesthesia. You may be asked to lie still for scans. Treatment may be given as a day case or during a short hospital stay. Your team will explain radiation safety steps, especially if permanent seeds are used.
Treatment
Brachytherapy delivers radiation from inside the body. Some types use temporary tubes that are removed after each treatment. Some use tiny permanent seeds that stay in place. Some use a mold placed on the skin. A team of specialists plans the dose and checks your safety. It may be the only treatment or part of a wider plan with surgery, external radiation, or other cancer care.
Self-care at home
- Follow your team's instructions about skin care, dressings, and washing.
- Rest when you need to and drink enough fluids unless told otherwise.
- Keep a note of side effects, medicines, and questions for your team.
- Use loose clothing over the treated area if it is sore.
- Ask before using heat, ice, creams, or supplements on the treated area.
- Follow advice about sexual activity, condoms, and close contact with pregnant women or young children if permanent seeds are used.
Medical treatments
Your cancer team may offer medicines to ease pain, nausea, bowel changes, or bladder symptoms. They may also give antibiotics if there is an infection. These are chosen and monitored by your healthcare team; do not start or stop medicines without asking them. Other cancer treatments, such as surgery or external radiation, may be used before or after brachytherapy.
When is surgery considered?
Brachytherapy is usually delivered through thin tubes, needles, or seeds rather than major surgery. Placing them may feel like a small procedure and may use numbing medicine or anesthesia. Sometimes brachytherapy is combined with surgery as part of the same cancer plan.
Living with this condition
Most people go home the same day or after a short stay. You may feel tired for a while and need to change your routine. Your team will tell you when you can drive, work, exercise, and have sex. If permanent seeds are used, you may have short-term radiation safety instructions. Follow them closely and ask questions.
Lifestyle tips
- Keep to a gentle routine and build activity back slowly.
- Avoid heavy lifting or strenuous exercise until your team says it is safe.
- Do not soak in a bath or use a hot tub until your team says it is okay.
- Ask about alcohol and travel plans during treatment.
- Keep follow-up appointments and report new symptoms early.
Diet and exercise
Eat regular balanced meals and drink enough fluids. If your bowel or bladder is irritated, your team may suggest small changes, such as eating more fiber or avoiding spicy foods for a while. Gentle walking and light activity can help with tiredness. Ask your team before starting harder exercise.
Mental health and emotional wellbeing
It is normal to feel anxious, low, or overwhelmed during cancer treatment. These feelings can affect sleep, appetite, and relationships. Talking to your team, a counselor, or a support group can help. If you have thoughts of harming yourself, call your local emergency number or a crisis support service in your country right away.
Prevention
Brachytherapy itself cannot be prevented because it is a treatment. The cancers it treats may sometimes be prevented or found earlier. Not smoking, limiting alcohol, staying active, eating well, protecting skin from sun, and attending screening can lower risk for some cancers.
Vaccines
Some cancers are linked to viruses. Vaccines against HPV and hepatitis B can lower the risk of cancers linked to these viruses. Ask your healthcare provider whether these vaccines are recommended for you or your family.
Screening programmes
Screening programs can find some cancers early, when treatment may work better. Examples include cervical, breast, and bowel screening. Prostate screening is discussed individually. Ask your local health service what screening is right for you.
Complications
If left untreated
- The cancer brachytherapy is meant to treat may keep growing or spread if not treated.
- Symptoms such as pain, bleeding, or pressure may get worse.
- Brachytherapy can cause side effects, including bleeding, infection, urinary or bowel changes, sexual problems, skin changes, and tiredness.
- Rarely, a catheter or implant can move or cause injury; your team checks for this.
Long-term outlook
Brachytherapy can cure or control some cancers, or help ease symptoms. Many people cope well with treatment and side effects can often be managed. Your outlook depends on the cancer type, stage, and your overall health. Your team will explain what to expect and support you at every step.
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Always verify with your doctor
Health guidance differs by country and region. This page is general education and may not match the guidelines, medicines, or practice where you live. Discuss your concerns with your own doctor or healthcare provider, and follow local guidance where it exists.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
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Sources and guidance
No guideline names this topic
No health guideline or clinical chapter that names this exact topic is cited here. This page is for general education and information only. It is not a diagnosis, a treatment plan, or personal medical advice. Check with your own doctor and follow their advice. If symptoms are severe, sudden, or worrying, get medical care promptly, and call your local emergency number in an emergency. Ruqelo LLC is not responsible for medical or legal outcomes from decisions based on this information.
Last updated: November 3, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.
Guidance may differ by country or region. Confirm local recommendations with a qualified healthcare provider.