The side effects of radiotherapy are mainly localized, and the side effects of chest radiotherapy are often manifested in the following aspects: 1. radioactive esophagitis: generally occurs after 10-15 times of radiotherapy, mainly manifested as a foreign body sensation in swallowing in mild cases and painful swallowing in severe cases, which affects eating; 2. radioactive skin reaction: because the radiation enters the body by the skin, chest radiotherapy can produce chest radioactive skin reaction, which generally occurs after 10 times of radiotherapy; 3. 3.Bone marrow suppression: the bone marrow suppression effect of radiotherapy is lighter than that of chemotherapy, but it also exists. During radiotherapy, regular blood tests should be conducted to detect the problem and provide timely treatment. 4.Radiation pneumonia: it mainly manifests coughing, coughing and difficulty in breathing, which usually occurs in the late stage of radiotherapy.