Thyroid cancer suspected of metastasis after surgery can be treated with radiotherapy, which needs to be chosen according to different pathological types, such as surgery, iodine 131 treatment, radiotherapy and targeted drug therapy. For differentiated thyroid cancer and medullary thyroid cancer with cervical lymph node metastasis after surgery, surgical resection should be preferred if there are indications for surgical treatment. For inoperable differentiated carcinoma, iodine 131 treatment can be considered. For inoperable medullary carcinoma, targeted drug therapy can be considered. For undifferentiated cancer, radiotherapy should be considered. Please consult your doctor for specific treatment and do not use medication on your own.