One of the most important physiological roles of the thyroid gland is the production of thyroid hormones. Therefore, in low thyroid, the body does not have enough thyroid hormone for the body’s use, resulting in many symptoms. The full name of low thyroid (hypothyroidism) is hypothyroidism. There are many causes of hypothyroidism, such as congenital hypothyroidism, hypothyroidism after thyroiditis, and hypothyroidism caused by iodine 131 treatment or thyroid surgery. There are two types of low thyroid, one is temporary and can be stopped after taking thyroxine for a period of time. The other is permanent, which means taking thyroxine tablets for life. Women of childbearing age with hypothyroidism can have the same chance of getting pregnant and becoming mothers as other women of childbearing age, as long as the thyroid hormone levels in their bodies are adjusted to normal. In addition, thyroid hormone is a kind of hormone in the human body itself, not the kind of hormone (such as prednisone, etc.) that people often talk about, so it will not affect the development of the fetus if you take the medicine normally. Pregnant women with low thyroid should not stop taking their medication when they are pregnant. However, when you are pregnant, because the fetus does not have the ability to synthesize thyroid hormones, and because thyroid hormones are needed for the development of the fetus, it is necessary to test your thyroid function on a regular basis, and you need to increase the dosage of thyroid hormones appropriately. Remember, pregnant women with hypothyroidism should not just reduce or stop their medication. When you are pregnant, you should go to the hospital for regular checkups. For women of childbearing age who have had previous thyroid disease, it is best to have thyroid hormone levels tested before preparing for pregnancy, and to have regular thyroid hormone checkups and obstetrical checkups during pregnancy.