Local radiotherapy is to kill the diseased cells through radioactive instruments to achieve the purpose of treatment, but at the same time will also kill part of the normal cells, causing more serious effects on the body mainly include the following aspects: 1. systemic effects: when the scope of local radiotherapy is relatively large, it may lead to systemic effects. 1. bone marrow suppression: causing the number of platelets and white blood cells to drop, you can give drug therapy or blood transfusion under the guidance of the doctor Ensure the number of white blood cells and platelets. If platelets and white blood cells are below a certain level, it may be necessary to stop radiotherapy to prevent causing infection; 2. Destruction of immune function: Radiotherapy may destroy the immune system and immune cells, causing immune function suppression, which can improve the situation by increasing the body’s immunity; 3. Gastrointestinal reaction: It may destroy the digestive tract, causing nausea, vomiting, loss of appetite or diarrhea. The diet can be adjusted or medication can be given under the guidance of doctors; 4. Allergic reactions: Some patients may suffer from allergic reactions due to decreased immunity, including itchy skin, erythema, hives and other symptoms. 2. Local effects: Local radiotherapy mainly affects the radiotherapy part, such as skin radiotherapy may cause blisters and ulcers, and oral radiotherapy may cause mouth ulcers, etc. The symptoms manifested vary according to the radiotherapy site.