It is usually better to control the thyroid function triple test within the normal value after thyroid cancer surgery. For patients taking thyroxine preparations for a long period of time after thyroid surgery to supplement the thyroxine deficiency after thyroidectomy, the thyroid function triple test, i.e. serum free thyroxine FT4, serum free triiodothyronine FT3, and thyrotropin TSH, should be checked regularly and should be maintained within the normal range. If the administered dose is insufficient, the thyrotropin TSH will increase and vice versa, so the measurement of thyrotropin TSH can be used as a basis for adjusting the dose of thyroxine preparation, in addition, it is usually necessary to combine with the results of the thyroid protein and the clinical manifestations, to determine whether there is a recurrence or metastasis may be. Patients are advised to follow the doctor’s instructions and not to treat the disease blindly on their own, so as to avoid delaying the disease or affecting the postoperative recovery.