Radiation therapy for lung cancer is also known as baking electricity, which kills lung cancer cells through radiation. If the tumor is confined to the lung, but surgery cannot guarantee the complete removal of the tumor, radiotherapy can be used to kill the tumor cells to control the tumor and prolong life. In addition to irradiating the tumor in the lung, radiation therapy is also needed to irradiate the lymph nodes in the mediastinum and other areas where lung cancer can easily metastasize. Some patients may have their tumors shrunk after radiation therapy and may undergo surgery to remove them again. If the patient’s physical condition allows, radiation therapy and chemotherapy can be administered simultaneously for the best treatment effect.