Gestation transient thyrotoxicosis refers to nonautoimmune hyperthyroidism in pregnant women and it is associated with hyperemesis gravidarum. During pregnancy, there are some alterations in thyroid gland, such as elevation of thyroxine binding globulin, increased iodium clearance in kidneys, and stimulation of thyroid gland by human chorionic gonadotropin. Hitherto, the patholphysiology underl…