Radiotherapy

Radiotherapy is a treatment where radiation is used to kill cancer cells.

When radiotherapy is used

Radiotherapy may be used in the early stages of cancer or after it has started to spread.

It can be used to:

Types of radiotherapy

Radiotherapy can be given in several ways. Your doctors will recommend the best type for you.

The most common types are:

Radiotherapy is usually given in hospital. You can usually go home soon after external radiotherapy, but you may need to stay in hospital for a few days if you have implants or radioisotope therapy.

Read more about what happens during radiotherapy.

Side effects of radiotherapy

As well as killing cancer cells, radiotherapy can damage some healthy cells in the area being treated.

This can cause some side effects, such as:

Many of these side effects can be treated or prevented and most will go away after treatment stops.

External radiotherapy does not make you radioactive, as the radiation passes through your body.

The radiation from implants or injections can stay in your body for a few days, so you may need to stay in hospital and avoid close contact with other people for a few days as a precaution.

You may need to avoid close contact with children and pregnant women when you go home for a short time. Your care team will let you know what to do.

Read more about the side effects of radiotherapy.

Page last reviewed: 5 June 2023
Next review due: 5 June 2026