After thyroid cancer surgery, most people have to take medication for life, but whether to take medication or not needs to be decided according to the size of the excised parts of the thyroid cancer during the surgery, as follows: 1. More excisions: When thyroid cancer surgery is performed, total excision of the thyroid gland and surrounding lymph node clearance may be performed, so the surgery is more thorough at this time and more parts of the thyroid gland are excised, so hypothyroidism occurs after surgery. Most of them need to take thyroxine tablets for life to supplement and replace. On the other hand, thyroxine tablets should be taken to suppress the TSH level to reduce the recurrence of thyroid cancer after surgery. 2. Less resection: If the patient has not removed many parts of the thyroid gland after surgery, and has undergone unilateral lobectomy or partial resection, this patient should also take medication after surgery, but the specific medication should be determined according to the thyroid function and TSH level.