Hyperemesis gravidarum is extreme, persistent nausea and vomiting during pregnancy. It can lead to dehydration, weight loss, and electrolyte imbalances.

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Hydatidiform mole (HM) is a rare mass or growth that forms inside the womb (uterus) at the beginning of a pregnancy. It is a type of gestational trophoblastic disease (GTD).

Nausea and vomiting occur in up to 90% of pregnancies. For many, these symptoms are a mild annoyance. Others develop a severe form called hyperemesis gravidarum.