In eight-month pregnant women, subclinical hypothyroidism usually requires treatment. Subclinical hypothyroidism combined with TPOAb-positive or TPOAb-negative, TSH>10mIU/L can be treated with levothyroxine sodium. Reduce the incidence of adverse perinatal outcomes. Specific treatment regimens should be discussed in detail with the physician. Subclinical hypothyroidism can occur with normal thyroid hormone levels but elevated thyroid stimulating hormone (TSH); medication is generally recommended for pregnant women with subclinical hypothyroidism in the eighth month of life to reduce the incidence of adverse perinatal outcomes. The main therapeutic drug is levothyroxine sodium, which is recommended for the following groups: subclinical hypothyroidism combined with TPOAb positive, or TPOAb negative, TSH>10mIU/L. The specific treatment plan should be consulted with the doctor, according to their own conditions. During pregnancy, nutrition should be strengthened, regular physical examination should be conducted to monitor the intrauterine development of the fetus; the monitoring of the fetus during pregnancy and delivery should be strengthened to detect fetal distress in time; attention should be paid to the prevention of post-partum hemorrhage and puerperal infection. Pregnant women with subclinical hypothyroidism are advised to go to the hospital and ask the doctor to determine whether medication is needed.