There are two types of pregnancy combined with thyroid disease: First, pregnancy with primary hyperthyroidism, and if it is combined with hyperthyroidism, anti-thyroid medication should be taken. If hyperthyroidism is not effectively controlled, it may result in preterm labor, miscarriage, or stillbirth. Propylthioxypyrimethamine is usually used for treatment. The amount of this drug passing through the placenta is very small and will not affect the fetus too much. If hypothyroidism is not treated, the child born in the future may have dementia and its intellectual development may be affected. Hypothyroidism is generally treated with eugenol, a drug that has no effect on fetal development and is relatively safe. Whether you have combined hyperthyroidism or hypothyroidism, it is important to review your thyroid hormone levels every month during pregnancy and then visit a specialized secretion unit to adjust the dosage of the relevant medication.