Hypothyroidism is short for hypothyroidism. Women with clinical hypothyroidism can be considered for pregnancy when their thyroid hormone levels are restored to normal by levothyroxine replacement therapy. The goal of thyroid hormone-specific therapy for women with clinical hypothyroidism prior to pregnancy is a serum thyrotropin of 0.1 to 2.5 mU/L, with a more desirable goal of an upper cut-off value of thyrotropin of 1.2 to 1.5 mU/L. Although there is no difference in pregnancy outcome between these two control levels, the risk of mild hypothyroidism in the latter group early in pregnancy is further reduced. It is recommended that women with clinical hypothyroidism should visit a regular hospital in time before pregnancy to complete the relevant examinations and receive reasonable treatment under the guidance of the doctor.