Hypothyroidism is a common endocrine disease. If the examination confirms hypothyroidism, treatment differs according to clinical typing, mainly as follows: 1. Subclinical hypothyroidism: TSH does not exceed 10 mU/L. If the patient’s symptoms are not obvious, antibody TGAb and TPOAb are not high, and blood lipids are normal, drug therapy is not necessarily used, and regular review is recommended; 2. Clinical hypothyroidism: free T3 and free T4 are reduced and TSH is increased. It is recommended to take eugenol, which is a levothyroxine tablet, once a day to make up the thyroxine and to review it regularly. If the thyroid function is normal, it will be reviewed once every 3 months or even once every 6 months, including thyroid ultrasound, and the medication will be adjusted according to the results. Hypothyroidism is a lifelong disease, and once you take the medication, you may have to take it for life. Therefore, patients should be told not to stop taking the medication in the middle, as thyroid function will rebound if they stop taking the medication, and to adjust the medication reasonably under the guidance of the doctor. Regular review, up to six months, is basically required once every three months. Because the change of seasons will affect thyroid hormones, for example, thyroid hormones may need less when it is hot and more when it is cold, so appropriate adjustment is needed. So basically, patients should be checked once every 3 months.