One month after the total thyroidectomy, it is appropriate to check the thyrotropin level below 0.5mU/L, which can reduce the chance of recurrence of thyroid malignant tumor. Total thyroidectomy is generally used in the clinic to treat malignant tumors of the thyroid gland, which requires removal of the thyroid gland, in theory, thyroid cancer thyrotropin level control is low, which can significantly reduce the chances of recurrence of malignant tumors of the thyroid gland. The requirements are different for patients at high and low risk of recurrence. For patients with high risk of recurrence of thyroid malignant tumors, thyrotropin levels generally need to be controlled to less than 0.1 mU/L, for intermediate-risk patients need to be controlled to between 0.1 and 0.5 mU/L, and for low-risk patients it is recommended that they can be around 0.5 mU/L. After surgery for thyroid malignant tumors, thyroid stimulating hormone levels can be regulated by oral levothyroxine sodium as prescribed by the doctor. Thyroid tumor patients after surgery, it is recommended that regular hospital visits, monitoring thyroid function, standardized regulation, and monitoring changes in tumor indicators, early detection and early treatment to avoid adverse consequences.