Radiotherapy often causes tiredness. You will also lose hair in the treated area. Other side effects will depend on the part of your body being treated. Treatment to the tummy area (abdomen) can make you feel sick or be sick, and can cause diarrhoea. If you have radiotherapy to the neck, it can make your mouth or throat dry and sore.
Side effects can be mild or they might cause you more trouble, depending on how much treatment you have. Your cancer doctor will tell you what to expect. Most side effects disappear gradually once your radiotherapy treatment is over.
Always tell your cancer doctor and specialist nurse about your side effects during and after radiotherapy. They can prescribe drugs to control them and give you advice on how to manage them.
Radiotherapy can have long-term side effects. These are rare and will vary depending on the part of the body treated. Your cancer doctor can tell you more.