It is possible for pregnancy to cause transient hyperthyroidism of pregnancy, and Graves’ disease of pregnancy can also occur. Elevated levels of human chorionic gonadotropin (hCG) in the body during pregnancy can lead to an increase in thyroid hormone synthesis, which can improve later in the pregnancy as hCG falls back. Graves’ disease in pregnancy is treated with propylthiouracil in early pregnancy and methimazole in mid to late pregnancy, with the goal of controlling the progression of hyperthyroidism and helping to allow the woman to complete the pregnancy as well as deliver the baby. If hyperthyroidism is detected during pregnancy, it is recommended to visit a regular hospital and be treated under the guidance of a specialist.