High thyroid hormone in pregnant women may be a normal physiological phenomenon, or there may be hyperthyroidism in pregnancy, it is recommended to consult a doctor. 1. Physiological manifestations: During pregnancy, under the stimulation of estrogen, hepatic production of thyroxine-binding globulin (TBG) increases and its clearance decreases. TBG increases from the 6th to the 8th week of gestation and reaches its peak in the 20th week of gestation, generally increasing 1.5-2 times compared with the basal value, and continues until delivery. The increase in TBG brings about an increase in total thyroxine (TT4) concentration, so TT4 does not reflect the exact level of circulating thyroid hormones during pregnancy. 2. Pathological manifestations: If the thyroid hormone is high and obvious, it is necessary to consider whether there is hyperthyroidism syndrome in pregnancy; at this time, it is necessary to carry out further examinations, such as thyroid function tests, thyroid autoantibody tests, blood routine, biochemical tests, thyroid ultrasonography and so on, in order to clarify the condition. Pregnant women with high thyroid hormone should promptly clarify whether the cause is physiological or pathological, and if there is a pathological cause, treatment should be carried out according to the condition, so as not to affect the development of the fetus.