Women with thyroid disease affect pregnancy. The thyroid gland is an important endocrine gland in the body, and the function of the thyroid gland is to secrete thyroid hormones. Thyroid hormones are important hormones that affect human growth and development and material metabolism. When the thyroid gland becomes hyper- or hypo-secretory for various reasons, it can affect pregnancy in female patients. The effects of thyroid disorders on pregnancy include the following: a. When the thyroid gland secretes too much thyroid hormone, that is, hyperthyroidism can lead to endocrine disorders in women, resulting in menstrual disorders, reduced menstruation, and affecting ovulation function, resulting in low conception rate or even infertility in female patients. When the thyroid gland secretes less thyroid hormone, it will lead to hypothyroidism. When hypothyroidism is present, women will show excessive menstruation, decreased libido and decreased egg quality, which will also affect the pregnancy process and lead to low conception or even infertility. Third, the lack of thyroid hormone during pregnancy will not only affect the growth and development of the fetus, but also affect the development of the fetal nervous system, resulting in reduced intellectual development.