Whether a pregnant woman with a TSH of only 0.01 is serious needs to be considered in the context of the specific situation. when the TSH, or thyroid stimulating hormone, is very low, if the pregnant woman herself does not have thyroid disease, and her thyroid hormone level is normal, then it may be a transient hyperthyroidism caused by pregnancy, and thyroid function needs to be monitored. If the pregnant woman’s examination reveals a substantial increase in thyroid hormone or if she herself has hyperthyroidism, she will need to be treated according to her condition. Thyroid hormone is an important hormone for maintaining fetal growth and development during pregnancy, and TSH is an important indicator for assessing thyroid function. TSH is an important indicator for assessing thyroid function. During pregnancy, the thyroid gland is moderately enlarged due to the effects of TSH and hCG. Therefore, in early pregnancy, TSH will show a transient decrease, and then rise to the pre-pregnancy level at the end of early pregnancy, after which it remains stable. Most pregnant women have a TSH of only 0.01 in early pregnancy, with no elevation of other thyroid hormones, and the TSH is normal after retesting, i.e., transient hyperthyroidism. It is due to the stimulation of the thyroid gland by the elevated level of hCG in early pregnancy, which is a normal physiological state in early pregnancy and generally requires no special treatment. In addition, a small number of pregnant women themselves suffer from hyperthyroidism, TSH 0.01, accompanied by extreme elevation of thyroid hormones, indicating that the hyperthyroidism is more serious, and need to be treated with medication. Hyperthyroidism may cause miscarriage, abnormal fetal development, or even preterm labor, and pregnant women may develop hypertensive disorders or even thyroid crisis, which need to be actively treated and controlled. Pregnant women with abnormalities such as reduced TSH need to be immediately hospitalized, under the guidance of a physician to complete the relevant examinations and treatments, and do not use medication privately, so as not to cause adverse consequences.