Hypothyroidism cannot be recovered after hyperthyroidism. Thyroid hormones play a vital role in human growth and development, and if hypothyroidism occurs after hyperthyroidism, it is generally necessary to take levothyroxine for long-term replacement therapy, commonly used as euthyroxine. After the surgery, the thyroid function must be reviewed regularly to detect hypothyroidism in time and apply levothyroxine for replacement therapy as early as possible. During the medication period, the level of thyroid function should be reviewed every 4-6 weeks so that the medication dose can be adjusted until the thyroid hormone level reaches the standard, and even after reaching the standard, the hormone level should be reviewed every 6-12 months so that abnormalities can be detected and dealt with in time.