If radiation caused cancer you would wonder why cancer patients were given radiation. Radiation is used on cancer patients to destroy all cancer cells. But, like other treatments, they often cause side effects. radiation therapy can also damage healthy cells and tissue near the treatment area. This is why it can be harmful. These are different for each person. They depend on the type of cancer, its location, the dose of radiotherapy and your general health. Most side effects disappear after treatment. But some continue, return or develop later. You may include developing a second cancer due to radiation therapy. Radiotherapy is a local treatment. it affects only the area of ​​the body where the tumor is located. Common general side effects of radiation skin problems, fatigue, hair loss, radiation recall, loss of appetite, attention or thinking or memory