This article reviews the prevalence and etiology of hyperthyroid ism i
n pregnancy; hyperthyroidism caused by the inappropriate secretion of
human chorionic gonadotropin; potential maternal, fetal, and neonatal
morbidity in hyperthyroidism during gestation; prepregnancy counseling
; issues related to breast-feeding in mothers taking antithyroid drugs
; and postpartum thyroid dysfunction in patients with Graves' disease.