Pregnancy does not usually lead to worsening of hyperthyroidism, so hyperthyroidism is not an absolute contraindication to pregnancy. It is generally recommended that patients with hyperthyroidism should get pregnant after the disease has recovered and the medication has been completely stopped. However, if the patient’s condition is well controlled at this stage and only requires a small dose of medication for maintenance, pregnancy is also allowed and is generally considered to have no increased complications during pregnancy and the prognosis for the mother and the newborn is good. On the contrary, if the hyperthyroidism condition is not well controlled, pregnancy is not advisable. Otherwise, it is easy to cause miscarriage and preterm delivery. In addition, hyperthyroid pregnant women with hypermetabolism can not provide sufficient nutrition and oxygen for the fetus, which can lead to fetal growth restriction and intrauterine distress. In terms of medication, pregnant women with hyperthyroidism should choose propylthiouracil instead of tabazole. The former has a larger molecular weight after combining with proteins in the pregnant woman’s body, passes through the placenta slowly, and enters into the fetus’s blood in smaller quantities, so it will not affect the fetus. In addition, during pregnancy, it is necessary to closely monitor the thyroid function and adjust the dosage of propylthiouracil in time to maintain the thyroid function at the level of 1/3 of the upper limit of the normal value, and it is important not to overdose, which may lead to hypothyroidism and affect the brain development of the fetus. Antithyroid drugs (ATD) can be secreted from breast milk, affecting the thyroid function of the fetus, so patients with hyperthyroidism should not breastfeed when taking ATD treatment.