Is brachytherapy the same as regular radiation therapy?

No. Brachytherapy is a form of radiation therapy, but the radioactive source is placed inside the body near the tumour instead of being delivered from a machine outside the body. This close placement allows a high dose to a small area and is why it is often used for cancers such as cervix and prostate.

How long does a brachytherapy treatment take?

It depends on the type. HDR brachytherapy often takes only a few minutes of actual radiation delivery per session, though preparation, imaging, anesthesia, and recovery can make the visit much longer. LDR or permanent seed treatments may involve a procedure in which the source stays in place for days or permanently.

Will I be radioactive after brachytherapy?

Usually not after temporary HDR brachytherapy, because the source is removed at the end of treatment. After permanent seed implants, such as some prostate treatments, a low level of radiation remains for a period of time. Your team will give specific safety instructions if any contact precautions are needed.

Why is brachytherapy so important in cervical cancer?

For many patients with locally advanced cervical cancer, brachytherapy is a standard part of curative treatment after external beam radiation and chemotherapy. It helps deliver a very high dose directly to the cervix and nearby tumour while limiting dose to the bladder and rectum. Reviews have shown that replacing it completely with external beam treatment can lead to worse local control in many cases.

What side effects should I expect from brachytherapy?

Side effects depend on the body area treated. Pelvic brachytherapy can cause temporary urinary burning, diarrhoea, vaginal irritation, or discharge, while prostate brachytherapy may cause urinary frequency or retention. Some late effects, such as bowel or bladder irritation, erectile dysfunction, or vaginal narrowing, can appear months later, so follow-up is important.

Brachytherapy — Glossary | India Cancer Guide

What it is

Brachytherapy is internal radiation therapy that places a radioactive source inside or next to a tumour, often for minutes or permanently. The key practical fact is that high-dose-rate (HDR) brachytherapy may deliver treatment in just a few minutes per session, while some low-dose-rate (LDR) implants stay in the body and give off radiation over weeks to months.

Unlike external beam radiation therapy, which sends radiation from a machine outside the body, brachytherapy puts the source very close to the cancer. This lets doctors give a high dose to a small target while reducing radiation to nearby normal tissues. It is also called sealed-source radiotherapy because the radioactive material is enclosed in a device such as a seed, wire, catheter, or applicator.

Brachytherapy is used for several cancers, including cervical, endometrial, vaginal, vulvar, prostate, breast, head and neck, skin, eye, oesophageal, and some soft-tissue cancers. In India, it is especially important in cervical cancer care, where brachytherapy is a standard part of curative treatment for many locally advanced cases.

A simple way to think about it is:

Type	How it is given	Typical timing
HDR brachytherapy	Source is placed temporarily, then removed	Minutes per treatment, often over several sessions
LDR brachytherapy	Small radioactive sources give off radiation slowly	Continuous low-dose exposure over days to months
Permanent seed implant	Tiny seeds are left in place	Common in prostate cancer

How it works

Brachytherapy works by delivering ionising radiation directly to cancer tissue. Radiation damages DNA inside cells, making it harder for cancer cells to divide and survive. Because the source is very close to the tumour, the radiation dose falls off quickly with distance. This steep drop in dose is one of the main reasons brachytherapy can spare nearby organs better than some other techniques.

The exact method depends on the cancer site:

Intracavitary brachytherapy places the applicator inside a body cavity, such as the uterus or vagina.
Interstitial brachytherapy places needles, catheters, or seeds directly into tissue, such as the prostate or breast.
Surface or plaque brachytherapy may be used for certain eye or skin tumours.
Intraluminal brachytherapy places the source in a hollow organ, such as the oesophagus or airway in selected cases.

Modern brachytherapy usually uses imaging such as ultrasound, CT, or MRI for planning and placement. The radiation oncologist and medical physicist calculate the dose carefully to cover the tumour while limiting exposure to organs at risk, such as the bladder, rectum, bowel, or urethra.

Evidence and uses

Brachytherapy is an established cancer treatment, not an alternative or experimental therapy. It may be used alone, with external beam radiation, after surgery, or sometimes with chemotherapy, depending on the cancer type and stage.

Common uses include:

Cervical cancer: A core part of curative treatment for many patients receiving chemoradiation. Reviews and guidelines consistently show that omitting brachytherapy can reduce local control and survival compared with standard treatment.
Prostate cancer: Used either as permanent seed implantation or temporary HDR treatment in selected patients with localised disease.
Endometrial cancer: Often used as vaginal cuff brachytherapy after surgery in patients at risk of local recurrence.
Breast cancer: In selected patients, brachytherapy can be used for partial-breast irradiation.
Palliative care: Sometimes used to relieve symptoms such as bleeding or obstruction in cancers of the oesophagus, bronchus, or gynecologic tract.

Brachytherapy is often chosen because it can provide:

A high dose to the tumour
Shorter treatment time in some settings
Better dose shaping near critical organs
A radiation "boost" after external beam therapy

That said, it is not suitable for every patient or every tumour. The tumour size, shape, location, spread to lymph nodes, prior radiation, anatomy, and overall treatment goal all matter. In cervical cancer, for example, brachytherapy remains a standard part of treatment even as external beam techniques have improved, because the dose needed to control the primary tumour is difficult to achieve safely without it.

Safety and interactions

Brachytherapy is a local treatment, so side effects usually depend on the body area treated. Common short-term effects can include:

Soreness, swelling, or bruising at the treatment site
Fatigue
Urinary burning, frequency, or retention after prostate or pelvic treatment
Diarrhoea, rectal irritation, or vaginal irritation after pelvic treatment
Temporary bleeding or discharge after gynecologic procedures

Possible longer-term risks depend on the site and dose. These may include scarring, narrowing of a passage, bowel or bladder irritation, erectile dysfunction, vaginal stenosis, tissue ulceration, or, rarely, fistula formation. Serious complications are uncommon but can occur, especially when treatment is technically difficult or when prior radiation has already been given.

Radiation safety depends on the type used:

Temporary HDR brachytherapy: The source is removed after each treatment, so patients are generally not radioactive afterward.
Permanent seed implants: A small amount of radiation remains for a period of time. Patients may be advised to limit close contact with pregnant women or small children for a defined interval, depending on the isotope and local protocol.

Brachytherapy does not usually have "drug interactions" in the way medicines do, but it can interact with other treatments in a practical sense. Prior pelvic surgery, anticoagulants, implanted devices, active infection, or previous radiation may affect whether the procedure is safe or feasible. Ask your radiation oncologist about preparation, anesthesia, pain control, and any temporary precautions at home.

When to see a clinician

See your cancer team promptly if you have:

Fever, chills, or signs of infection after the procedure
Heavy bleeding or worsening discharge
Severe pain not controlled by prescribed medicines
Trouble passing urine or stool
New leg swelling, shortness of breath, or chest pain
Persistent diarrhoea, rectal bleeding, or severe burning with urination

You should also ask for review if you are told brachytherapy is recommended but you do not understand why it is needed in addition to external radiation or chemotherapy. In several cancers, especially cervical cancer, it is a planned part of curative treatment rather than an optional add-on.

Limitations and open questions

Brachytherapy is highly effective in the right setting, but it is technically demanding and not available in every centre. Outcomes depend on imaging, applicator placement, dose planning, and team experience. Access can be uneven, including in low- and middle-income settings.

Evidence is strongest for cancers such as cervix and prostate, where brachytherapy has a long track record. In some other cancers, its role is more selective and may vary by institution. Research continues on MRI-guided planning, better dose optimisation, combining brachytherapy with newer systemic therapies, and ways to reduce long-term side effects.

For patients, the main limitation is that brachytherapy is site-specific and individualised. Two people with the same cancer type may receive very different brachytherapy schedules or may not both be candidates. The best source of guidance is a radiation oncologist who can explain the goal, expected benefit, alternatives, and likely side effects for your exact case.

Brachytherapy