Elevated thyroid hormones in early pregnancy are seen as hyperthyroidism in pregnancy and can have adverse effects on both the fetus and the mother. The level of control of hyperthyroidism in pregnancy is directly related to the outcome of the pregnancy; poor control can lead to adverse outcomes such as miscarriage, preterm delivery, intrauterine growth restriction, and can affect the intelligence and cerebral cortical volume of the offspring and increase the risk of maternal complications in pregnancy, such as gestational hypertension, thyroid crisis, and congestive heart failure. Routine screening of thyroid function should be carried out in early pregnancy, regardless of hypothyroidism or hyperthyroidism, if poorly controlled, it can cause adverse outcomes for mother and child, once abnormal thyroid function is found, it should be promptly consulted to endocrinology department for active treatment and regular monitoring of changes in the indexes.