Hyperthyroidism and hypothyroidism are both dangerous to the fetus. In the case of hyperthyroidism, the mother’s body is in a state of high metabolism, which makes the fetus prone to intrauterine asphyxia, preterm labor, and stunted growth. In the case of hypothyroidism, the fetus in the mother’s body can cause abnormalities in the development of the central nervous system or abnormalities in the development of the brain and spine of the child. Regardless of whether it is hyperthyroidism or hypothyroidism, the effect on the fetus may be fatal. If you have problems in this area, you should find a specialist to diagnose and treat the problem as soon as possible to ensure the normal development of the fetus. The exact treatment depends on the patient’s specific condition. Some women with hyperthyroidism or hypothyroidism are not suitable for childbearing or pregnancy.