Complications of thyroid cancer after surgery: one part is the localized corresponding changes of thyroid cancer surgery; the other part is the related complications due to the change of thyroid function after surgery. The former is mainly the feeling of neck tightness, localized edema, and hoarseness in some patients, which are related to the local damage after surgery, and will be gradually reduced and improved with the continuation of time. The latter is due to the impaired function of the parathyroid glands as a result of surgical resection, and patients may experience post-surgical hypocalcemia and convulsions, which need to be relieved by calcium supplements. In the postoperative period, some patients may develop hypothyroidism, and related abnormalities of blood lipids and blood calcium, at this time, thyroid hormone supplementation and replacement therapy is needed for postoperative hypothyroidism, and these complications should be handled accordingly according to different situations.