The number of radiotherapy treatments varies with different stages of lung cancer patients, different radiotherapy techniques and different segmentation methods. If it is early stage lung cancer, patients can receive stereotactic radiotherapy (SBRT) with 3-8 times of radiotherapy, which can accurately locate the tumors in the body, gather narrow beams of radiation at the target point, and irradiate them with larger doses in fewer fractions, so as to cause focal damage to the tumors, while minimizing the damage to the normal tissues. In locally advanced patients, lymph node metastasis usually occurs, which cannot be treated with radiotherapy using SBRT technique, and intensity-modulated radiotherapy (IMRT) technique, etc., is used to divide the radiation according to the radical dose of radiation needed for radiotherapy of lung cancer, which usually requires about 30 times. For advanced patients such as brain metastasis or bone metastasis, local palliative radiotherapy can be around 10-20 times. It is recommended that patients should go to the hospital in time, after clear diagnosis and staging, make the choice of radiotherapy according to their own conditions, and it is recommended that patients should pay attention to keeping warm and preventing from getting cold and flu during the radiotherapy or in the six months after the radiotherapy.