Iodine 131 is one of the adjuvant treatments for thyroid cancer after surgery, the main treatment for thyroid cancer is surgery, and whether it can be cured mainly depends on the pathology and stage, so iodine 131 cannot cure thyroid cancer. Iodine 131 is mainly used to remove the residual thyroid tissue after thyroid cancer surgery and metastatic foci of the tumor that can not be removed during thyroid cancer surgery, which is an auxiliary treatment for thyroid cancer surgery and can not cure thyroid cancer. Thyroid cancer surgery mainly involves removal of the primary tumor lesion and, depending on the lymph nodes due to lymph node metastasis, lymph nodes are cleared or the surgical scope of the surgery is enlarged for resection. Early papillary cancer can be cured in some patients through surgical treatment and adjuvant therapy, but the cure rate of follicular cancer is slightly worse, medullary carcinoma and undifferentiated carcinoma are generally incurable and have a poor prognosis. If you have thyroid cancer, you should seek medical treatment in time.