As a rule, pregnancy is not recommended in patients with uncontrolled hyperthyroidism because antithyroid medications may cause fetal malformations and suppress the thyroid function of the fetus. If possible, try not to take antithyroid medications during pregnancy, especially during the first 12 weeks of pregnancy. If you do need to take anti-thyroid medication, propylthiouracil tablets are preferred for treatment in the first 12 weeks of pregnancy. In the middle to late stages of pregnancy, treatment can be switched to methimazole tablets. For patients who are on antithyroid medication, you should consult your doctor about the possibility of pregnancy after thyroid function has returned to normal. During pregnancy, if anti-thyroid medication is taken for treatment, the dose of the medication should be adjusted according to the function of the thyroid gland in the mother’s blood.