Hyperthyroidism is the short form of hyperthyroidism. Hyperthyroidism may have an effect on pregnancy, which may cause infertility, affect the growth of the fetus and cause miscarriage. 1. Difficulty in getting pregnant: If you develop hyperthyroidism before getting pregnant and the condition is not effectively controlled, it may lead to infertility. As the thyroid gland is an important endocrine gland, its dysfunction usually affects the function of the entire endocrine system, resulting in abnormal hormone levels, which may lead to menstrual disorders, thus affecting the process of conception. 2. Affecting the growth of the fetus: thyroid hormone can promote the growth of fetal bones and the development of the nervous system, but too much thyroid hormone will affect the metabolic state of the mother, which may indirectly cause nutritional deficiencies in the fetus, seriously affecting growth and development. 3. Trigger miscarriage: when hyperthyroidism occurs in early pregnancy, it is easy to cause preeclampsia; if left untreated, the condition of hyperthyroidism progressively aggravates, and mid-pregnancy miscarriage may also occur. If hyperthyroidism occurs before or after pregnancy, you must consult a doctor in time and strictly follow the doctor’s instructions for treatment to avoid serious consequences.