What is radiotherapy?

Radiotherapy means the use of radiation, usually x-rays, to treat cancer cells. You might have radiotherapy from inside the body, this is called internal radiotherapy. Or external radiotherapy is from outside of the body.

Radiotherapy can be used to try to cure cancer, reduce the chance of cancer coming back or to help relieve symptoms. You might have it by itself or with other treatments such as chemotherapy or surgery.

Nearly 50 out of 100 (50%) people have radiotherapy at some point during their cancer treatment.

radiotherapy

radiotherapy

Most types of radiotherapy use photons. But you might have electrons or more rarely protons. Your doctor will decide which type you need.

How radiotherapy works

Radiotherapy is a type of ionising radiation (high energy) that destroys the cancer cells in the treated area by damaging the DNA of these cells. Radiation also affects normal cells. This can cause side effects in the area you’re receiving treatment.

Usually, the side effects improve a few weeks after treatment but some might continue long term. Your doctor should discuss this with you when you consent for radiotherapy and discuss possible ways to manage side effects.

Aim of radiotherapy treatment

Your radiotherapy treatment plan is individual to you.

It aims to give a high dose to the cancer but as low a dose as possible to the surrounding healthy cells.

This gives the highest chance of curing or shrinking the cancer while reducing the risk of side effects.

Your course of treatment

When deciding on your course of treatment your doctor takes into account:

your type of cancer
the position of the cancer in the body
any other treatment you’ve had, are having, or is planned for you
your general health and fitness
Radiotherapy with the aim of curing cancer usually lasts between 1 to 7 weeks.

For radiotherapy to relieve symptoms, you might have anything between a single treatment to 2 weeks of treatment. It might be longer than this. Your doctor will tell you how many treatments you’ll have.

Most people have daily treatment from Monday to Friday, with a rest at weekends. But this can vary. For example, you might have treatment once a week for a set number of weeks. It is also sometimes possible to have more than one treatment per day.

Let your radiographer (sometimes called a radiotherapist) know at your planning radiotherapy appointment if you have any commitments such as work or childcare that mean you need a specific time for your appointments. They will try to be as flexible as possible, but it can difficult depending on how busy the department is.

Worries about treatment

You may feel anxious about radiotherapy and this is perfectly normal. It can help to talk through any worries you have with your doctor, nurse or radiographer.

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