Thyroid nodules generally do not affect pregnancy, it is the function of the thyroid gland that affects pregnancy. Thyroid function can generally be seen through thyroid hormone measurements, generally thyroxine, which is T4, triiodothyronine, which is T3, free T3, T4, and thyrotropin, which is TSH, to determine whether thyroid function is hypo- or hyperthyroidism. The first is to promote the body’s growth and development; the second is to promote the body’s catabolism, and the main is to regulate the body’s energy, in all cases the thyroid gland, whether too high or too low, will have an impact on pregnancy. A low thyroid gland, that is, an underactive thyroid gland, will affect pregnancy, and the resulting child will have mental retardation. If the thyroid is hyperthyroid, it can have a greater impact on pregnancy. Many patients start with irregular, scanty or amenorrheic menstruation, and the chances of conception are very low. Even if they get pregnant, they are prone to miscarriage. Therefore, it is important to treat hyperthyroidism early and try to treat it before getting pregnant. For patients with low thyroid function, the thyroid dose should be adjusted so that the T3, T4 and TSH are basically within the normal range for pregnancy. After thyroid surgery, some patients have underactive thyroid, or use thyroid as suppressive therapy again, and at this time TSH can be clinically observed to be relatively low. If you try to reduce a certain dose appropriately before pregnancy, in the close to normal or normal low range, to minimize the impact on the fetus.