A small portion of the thyroid remaining after thyroidectomy may be useful. After thyroidectomy, the small part of the remaining thyroid gland can work normally and maintain the body’s thyroid function, then this part of the thyroid gland is useful, if the remaining part is not enough to maintain normal thyroid function, it is recommended to follow the doctor’s instructions for thyroid hormone replacement therapy. It is recommended that post-thyroidectomy patients should pay attention to rest, ensure sufficient sleep time, do not overwork, and at the same time pay attention to the dietary rules, meat and vegetables, eat more easily digestible food, eat less cold, greasy food, and postoperative regular checkups. After thyroidectomy patients should follow the doctor’s instructions for treatment.