The presence of high thyroid hormone in pregnant women may be related to physiologic and pathologic factors, such as combined hyperthyroidism in pregnancy. 1. Physiological factors: the placental secretion of human chorionic gonadotropin increases in early pregnancy, and human chorionic gonadotropin, whose alpha subunit is similar to that of thyroid-stimulating hormone, has a stimulating effect on the thyroid gland, thus leading to an increase in the level of thyroid hormone. 2. Pathological factors: when pregnancy is combined with hyperthyroidism, the thyroid gland is in a relatively active state during pregnancy, resulting in elevated levels of thyroid hormones. It is characterized by hypermetabolism, agitation, fear of heat and excessive sweating. When the thyroid hormone is high, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the help of the doctor, and carry out targeted treatment.