TSH refers to thyrotropic hormone, the value <0.005μIU/ml firstly, the cause of the disease should be clarified, and then the treatment for the cause. Low thyroid stimulating hormone may be related to pituitary hypothyroidism, non-thyroid stimulating hormone tumor caused by hyperthyroidism and so on. If it is hyperthyroidism, anti-thyroid drugs, iodine 131 or surgery can be chosen according to the specific situation. 1. Antithyroid medication: If the blood analysis shows no obvious leukopenia and the liver function shows normal liver function, antithyroid medication can be chosen, such as methimazole or propylthiouracil. 2. Iodine 131 treatment: Iodine 131 treatment can be chosen if hyperthyroidism has the following conditions: ① allergy to antithyroid drug treatment; ② combined with liver function damage; ③ recurrence after antithyroid drug or surgery; ④ moderate or above goiter and inoperable or refusing surgery. 3. Surgery: If the thyroid gland is moderately or severely enlarged, and there is pressure on the trachea causing breathing difficulties or pressure on the esophagus causing swallowing difficulties, surgery can be chosen. When abnormal thyroid stimulating hormone indexes are found, it is recommended to consult a doctor in time.