Adverse reactions after radiotherapy for lung cancer vary slightly according to the target area and lymphatic drainage area of radiotherapy. Some of the side effects of radiotherapy that will be encountered in clinic at present are as follows: 1. Mainly bone marrow suppression, just like chemotherapy will produce bone marrow suppression. If it is pure radiotherapy, the bone marrow suppression is very light; if the patient who has undergone multiple courses of chemotherapy then undergoes radiotherapy, the bone marrow suppression may be heavier, which is mainly manifested in the decline of white blood cells, platelets and hemoglobin; 2. Skin damage in the radiation area, which is mainly manifested in the form of skin pigmentation, skin breakage, and some of them may cause infections. Of course, this may be more common in the head and neck radiotherapy, in the lung radiotherapy response may be relatively mild, mainly in the performance of skin pigmentation. Doctors will tell patients to protect themselves appropriately, which can generally be tolerated; 3. Radioactive esophagitis, which is mainly manifested as pain in swallowing and obstruction in eating, usually occurs after 1 week of radiotherapy; in some patients, it occurs after 1 week of radiotherapy until the end of radiotherapy, including the end of the end of the day; in some patients with better tolerance, it may not occur; 4. Radioactive lung injury, as the radiation irradiation of the tumor will pass through the normal lung tissues and affect the lungs. will pass through the normal lung tissue and cause damage to the normal lung tissue. The degree of this also varies, usually mild ones do not need special treatment, while severe ones need to be treated by a doctor.