Vomiting of pregnancy, pernicious: Medically known as hyperemesis gravidarum, this is excessive vomiting in early pregnancy. By definition, hyperemesis gravidarum, leads to the loss of 5% or more of the body weight of the woman.
Hyperemesis gravidarum is usually self-limited (stops on its own) and, although very inconvenient and very discomforting, it is usually of little clinical consequence. However, sometimes hyperemesis can keep the mother from getting the necessary fluids and nutrition.
Some women with hyperemesis gravidarum have high concentrations of the hormones hCG (human chorionic gonadotropin) or estrogen or thyroid hormones in the blood. A few women also have clinical manifestations of hyperthyroidism (over-active thyroid state).
Hyperemesis gravidarum is the Latin for excessive vomiting in pregnancy. Hyper means "over"; emesis means "vomiting"; and gravidarum means "pregnant state."