Low thyroid stimulating hormone in early pregnancy may be related to elevated HCG levels, or Graves’ disease, such as transient hyperthyroidism in pregnancy caused by elevated HCG can be left untreated and observation can be strengthened. 1. Physiological factors: due to the increased secretion of human chorionic gonadotropin in early pregnancy, which can inhibit the production of thyroid stimulating hormone, resulting in low levels of thyroid stimulating hormone, usually in the mid-pregnancy and late pregnancy will gradually return to normal, it is recommended that regular review, can be appropriate to supplement proteins, such as eggs, milk, lean meats, soybeans and so on. 2. Pathological factors: If thyroid stimulating hormone is low in early pregnancy, and the values of T3 (triiodothyronine) and T4 (thyroxine) are also elevated, it is necessary to exclude Graves’ disease, and should follow the doctor’s instructions to further examine the thyroid-related antibodies, thyroid ultrasound, etc, to clearly identify the cause of the disease. There are many other reasons for low thyroid stimulating hormone in pregnant women, and it is necessary to go to the hospital for medical consultation to determine the cause and treatment under the guidance of the doctor.