ABSTRACT: Most women experience some type of morning sickness during pregnancy; however some of them have extreme morning sickness called hyperemesis gravidarum. This severe nausea and vomiting may be due to increased hormone levels; however, the exact cause is still unknown. Too much vomiting is harmful because it leads to dehydration and poor weight gain during pregnancy. Proper identification of symptoms and careful management of hyperemesis gravidarum is important to avoid serious complications for the infant or mother.