causes of hyperemesis
Hyperemesis gravidarum (HG) is a complication of pregnancy that is characterized by severe nausea and vomiting such that weight loss and dehydration occur. Signs and symptoms may include vomiting several times a day and feeling faint. It is more severe than morning sickness. Often symptoms get better after the 20th week of pregnancy but may last the entire pregnancy. The exact cause of hyperemesis gravidarum is not known. Risk factors include the first pregnancy, multiple pregnancy, obesity, prior or family history of hyperemesis gravidarum, trophoblastic disorder, and a history of an eating disorder. The diagnosis is usually made based on the signs and symptoms.