Hyperemesis gravidarum is severe nausea that occurs during pregnancy.
When you have hyperemesis gravidarum, you vomit a lot, sometimes almost constantly. This can lead to problems like dehydration and weight loss.
Morning sickness often fades by the end of the first trimester, but hyperemesis gravidarum usually lasts longer.
It generally strikes between the 4th and 6th week of pregnancy, and may be at its worst around weeks 9 to 13. The vomiting is so severe, most women are unable to go about their typical daily activities.
Symptoms usually get better by the 20th week, but not always.
Keywords: define hyperemesis gravidarum; definition of hyperemesis gravidarum.