Radiotherapy is a treatment involving the use of high-energy radiation. It’s commonly used to treat cancer. Almost half of all people with cancer have radiotherapy as part of their treatment plan.
Radiotherapy uses high-energy rays called radiation to treat cancer. It destroys cancer cells in the area where the radiotherapy is given.
Some normal cells in the area being treated can also be damaged by radiotherapy. This can cause side effects. These normal cells are usually able to repair themselves, but cancer cells cannot. As the normal cells recover, the side effects usually get better.
Radiotherapy is also sometimes used to treat benign (non-cancerous) tumours and other conditions, such as thyroid disease and some blood disorders.