Pregnancy while taking medication for hyperthyroidism needs to be discontinued or the dose reduced in a timely manner. Whether or not you can have a child needs to be determined in conjunction with the test results, and it is possible to have a child after a rigorous evaluation. It is best not to become pregnant while taking medication for hyperthyroidism, and close maternal, fetal, and neonatal monitoring should be performed if you do become pregnant. Antithyroid medications such as methimazole are able to cross the placental barrier and have the potential to cause serious pregnancy and fetal complications, including developmental malformations and miscarriage. The drug dose should be adjusted or discontinued promptly. If there is any fetal abnormality, it is recommended to terminate the pregnancy in time; if no fetal effect is found, the pregnancy can be continued, but it is necessary to do all the obstetrical examinations regularly and keep an eye on the development of the fetus, and if there is any abnormality, the pregnancy should also be terminated in time. While taking medication for hyperthyroidism, women of childbearing age are advised to use effective contraception, and if they become pregnant, they are advised to consult a doctor promptly.