First determine whether hyperthyroidism in pregnancy (Syndrome of Gestational Hyperthyroidism, SGH) 1) SGH features: onset in 8-10 weeks of pregnancy, symptoms such as palpitations, anxiety, excessive sweating, elevated blood FT4 and TT4, decreased TSH, negative thyroid autoantibodies. It is associated with pregnancy vomiting and occurs in 30-60% of patients with severe pregnancy vomiting 2) Treatment: symptomatic treatment is the main focus, control vomiting, correct dehydration, maintain water and electrolyte balance 3) Generally, hormone levels can return to normal at 14-18 weeks of gestation, thus ATD treatment is not advocated Pregnancy with Graves’ disease: serum TSH <0.1, ft4=""> upper limit of pregnancy reference value, with eye signs and 1) Propylthiouracil is preferred during the T1 period (1-12 weeks) to avoid fetal malformations. 2) After the T1 period, switch to methimazole to avoid hepatotoxicity. 3) Starting dose: 50-300 mg/d propylthiouracil and methimazole. 4) Monitor thyroid function, blood picture and liver function when switching drugs. 5) β-adrenoceptor blockers (e.g. In principle, no surgery, but if necessary, the best period is the second half of the T2 phase (13-27 weeks). The goals of hyperthyroidism control during pregnancy: 1) Prefer FT4, so that serum FT4 is close to or mildly above the upper reference value 2) Monitor TSH and FT4 every 2-4 weeks during the initial phase, and every 4-6 weeks after reaching the standard