Women of childbearing age are at high risk for thyroid disorders, and hyperthyroidism in particular is common. Hyperthyroidism during pregnancy affects both the pregnant woman and the fetus, so proper diagnosis and treatment are essential! Pregnancy and hyperthyroidism affect each other: 1. The effect of pregnancy on hyperthyroidism: pregnancy can cause aggravation or relapse of hyperthyroidism. 2. 2. Hyperthyroidism can affect both mother and child to different degrees: e.g. hyperemesis, hyperthyroid heart disease, neonatal hyperthyroidism, fetal congenital abnormalities, premature birth, stillbirth, low birth weight babies, etc. Diagnosis of hyperthyroidism in pregnancy: hyperthyroidism combined with pregnancy is common, especially in the first trimester. Symptoms of hyperthyroidism: fear of heat, panic attacks, sweating, etc. Some normal pregnant women also have similar conditions, and there are also compensatory goiter. Laboratory tests: TT3, FT3, TT4, FT4, TRAb are elevated, s-TSH is decreased, generally <0, 1mIU/L; FT4 can correctly determine the condition of hyperthyroidism treatment during pregnancy. Anti-thyroid medication (ATD): The goal of treatment is to control symptoms and restore thyroid function to normal in the shortest possible time, while ensuring no complications for the mother and fetus; the dose of ATD should be reduced as much as possible, and the target is to maintain serum FT4 in the upper 1/3 of the normal range; thyroid function should be checked every 2 weeks at the beginning of treatment, and then extended to once every 2-4 weeks; PTU's PTU has a low placental transmission rate and PTU should be preferred for the treatment of hyperthyroidism in pregnancy; MMI is used as a second-line drug, which may lead to fetal developmental disorders. Other treatments: β-blockers: For definite control of hyperthyroidism, they can be combined with ATD; control heart rate between 70-90 beats/min and discontinue as soon as possible after achieving it. Complications such as spontaneous abortion, intrauterine growth retardation, prolonged labor, neonatal bradycardia, hypotension, hypoglycemia and hyperbilirubinemia have been reported in the literature. Iodine: used before thyroid surgery and for thyroid crisis resuscitation. Surgical treatment : Less commonly used. 131I : prohibited.