Nausea - persistent - in pregnancy; Vomiting - persistent - in pregnancy
Hyperemesis gravidarum is extreme, persistent nausea and vomiting during pregnancy that may lead to dehydration.
Nearly all women have some nausea or vomiting, or "morning sickness " -- particularly during the first 3 months of pregnancy. The cause of nausea and vomiting during pregnancy is believed to be rapidly rising blood levels of a hormone called HCG (human chorionic gonadotropin), which is released by the placenta.
Extreme nausea and vomiting during pregnancy can happen if you are pregnant with twins (or more) or if you have a hydatidiform mole.
Hepatic and Gastrointestinal Diseases. In: Gabbe SG, Niebyl JR, Simpson JL. Obstetrics - Normal and Problem Pregnancies. 5th ed. New York, NY: Churchill Livingstone; 2007:Chap.43
Interventions for nausea and vomiting in early pregnancy. Cochrane Database Syst Rev. 2003;(4):CD000145. Review.