Subclinical hypothyroidism may affect pregnancy. If you are planning to get pregnant, it is recommended that you maintain your thyroid function at a normal level before getting pregnant, as subclinical hypothyroidism can have a significant impact on pregnancy. During pregnancy, subclinical hypothyroidism may affect the intellectual development of the fetus on the one hand, and the physical development of the fetus on the other hand, resulting in short height and low weight of the fetus, and may even increase the risk of miscarriage, preterm labor and other adverse outcomes of pregnancy. Therefore, it is recommended that pregnant women with subclinical hypothyroidism should go to the hospital as soon as possible for a detailed examination, and under the guidance of the doctor, treatment should be carried out to control the thyroid function to a normal level before considering pregnancy.