Hyperthyroidism can affect fertility. Hyperthyroidism is a common endocrine system disorder with hypermetabolic syndrome as the main clinical manifestation. Hyperthyroidism can cause damage to multiple tissues and organ systems, endocrine disorders, and in women, menstrual disorders and even infertility. During pregnancy, if hyperthyroidism is combined with hyperthyroidism, it can lead to congenital abnormal fetal development, stillbirth, premature birth and miscarriage. Therefore, it is important for women to be examined accordingly before preparing for pregnancy. Once you have hyperthyroidism, you should get the appropriate treatment before you consider preparing for pregnancy and having a baby. Once hyperthyroidism is diagnosed during pregnancy, it should be treated actively to keep the relevant indexes stable and to ensure the safety of the mother and the fetus.