Radiotherapy

Radiotherapy is often given with the aim of destroying a tumour and curing the cancer. When radiotherapy is given in this way it is described as radical radiotherapy.

Radiotherapy may be used on its own or may be given before or after surgery or chemotherapy. Chemotherapy is the use of anti-cancer drugs to destroy cancer cells. If radiotherapy and chemotherapy are given at the same time, this treatment is known as chemoradiotherapy.

For some types of curative radiotherapy treatment, you may need to go to the hospital each weekday for between two and seven weeks. In this situation, a small dose of radiotherapy is given each time. This is because as well as damaging cancer cells, radiotherapy can also cause damage to healthy cells in the treatment area. If a very high dose of treatment was given all in one go, it could cause too much damage to the healthy cells, so small doses are given to allow them to recover in between.

Radiotherapy is the use of high energy x-rays and similar rays (such as electrons) to treat disease.

Since the discovery of x-rays over one hundred years ago, radiation has been used more and more in medicine, both to help with diagnosis (by taking pictures with x-rays), and as a treatment (radiotherapy). While radiation obviously has to be used very carefully, doctors and radiographers have a lot of experience in its use in medicine.

Many people with cancer will have radiotherapy as part of their treatment. This can be given either as external radiotherapy from outside the body using x-rays or from within the body as internal radiotherapy.

Radiotherapy works by destroying the cancer cells in the treated area. Although normal cells can also be damaged by the radiotherapy, they can usually repair themselves.

Radiotherapy treatment can cure some cancers and can also reduce the chance of a cancer coming back after surgery. It may be used to reduce cancer symptoms.

General side effects of Radiotherapy

While radiotherapy can destroy cancer cells, it can also have an effect on some of the surrounding normal cells. The side effects that may occur are described in the following pages. It is important to remember that no person will have more than a few of them, and for many people they may be mild.

Years ago, in the 1950s and 60s, radiotherapy often caused very severe side effects, especially skin burns and scarring. There have been huge improvements in the machines that give the treatment, and severe side effects are now very rare.

As radiotherapy affects people in different ways, it is difficult to predict exactly how you will react to your treatment. Before you start, the staff will discuss with you any likely side effects of the particular treatment you are having. They can also give tips on how to deal with them and how they can be treated. Being aware of side effects in advance can help you to cope with any problems that occur.

Most side effects of radiotherapy disappear gradually once the course of treatment is over. However, for some people, they may continue for a few weeks.

Changes in your blood

Radiotherapy to some parts of the body may affect the bone marrow, which produces the different types of blood cells. If the doctors think this might happen to you, you will have regular blood tests during your treatment to check your blood counts (the number of cells in your blood). If your blood counts are low, you may feel tired and 'run down'. If your blood count becomes very low (which is unlikely), it may be necessary to have a short rest from treatment so that your blood cell levels can return to normal

Tiredness

You may feel very tired during your radiotherapy. This can often be made worse by having to travel to your treatment each day. Listen to your body, and if necessary, allow yourself extra time to rest, perhaps by taking a nap in the afternoons. It may help if you spread chores out over the week, sit down to do them, wherever possible, and accept any offers of help. Tiredness can be a problem for some months after your treatment has finished.

Appetite

As always during treatment of any kind, it is important to maintain a healthy diet and drink plenty of fluids. At times you probably won't feel like eating, or you may find that your eating habits change. It may be easier to have small snacks throughout the day rather than large meals. It is not unusual to lose a little weight during radiotherapy, but if you are having any problems with eating it is important to tell the radiotherapy staff.

Skin

Some people develop a skin reaction while having external radiotherapy. If this effects you, it will normally happen after 3–4 weeks. People with pale skin may find that the skin in the treatment area becomes red and sore or itchy. People with darker skin may find that their skin becomes darker and can have a blue or black tinge. The amount of the reaction depends on the area being treated and the individual's skin.

Some people have no skin problems at all. Your radiographers will be looking for these reactions, but you should also let them know as soon as you notice any soreness or change in skin colour.

It’s important not to use any creams or dressings unless they have been prescribed or recommended by your specialist or the radiographer.

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