Radiotherapy for thyroid cancer is generally applicable to undifferentiated thyroid cancer, residuals of surgery and some distant metastatic lesions. 1. Undifferentiated thyroid cancer: this kind of patients can choose radiotherapy. In addition, patients with thyroid cancer who cannot undergo surgical resection can choose radiotherapy. 2. Surgical residuals: after surgery, it is not completely removed and there is residual phenomenon, so palliative radiotherapy can be chosen according to the actual situation. 3. Partial distant metastatic foci: patients with partial distant metastatic foci, such as bone metastasis, are generally considered to choose palliative radiotherapy at this time. Radiotherapy for thyroid cancer is a kind of common operation, but those who have serious localized radiation injury or serious malignant disease cannot accept radiotherapy, so it is recommended to go to regular hospitals in time, listen to the doctor’s advice and choose the right treatment.