Radiotherapy uses high energy waves similar to x-rays to kill cancer cells. You might have radiotherapy to shrink the cancer, relieve symptoms such as bleeding and help you feel more comfortable.
The radiotherapy team plans your external beam radiotherapy before you start treatment. This means working out how much radiation you need to treat the cancer and exactly where you need it.
You might have radiotherapy to help with symptoms of advanced stomach cancer. You have radiotherapy in a hospital radiotherapy department.
The side effects of radiotherapy for advanced cancer depend on the area that your cancer has spread to. They can include feeling or being sick.