DefinitionBy Mayo Clinic staff
Morning sickness is nausea that occurs during pregnancy. Morning sickness is a misnomer, however, since it can strike at any time of the day or night.
Morning sickness affects a large proportion of pregnant women. Morning sickness is most common during the first trimester, but for some women morning sickness lingers throughout pregnancy. Treatment isn't usually needed for morning sickness — although various home remedies, such as snacking throughout the day and sipping ginger ale, often help relieve nausea.
Rarely, morning sickness is so severe that it's classified as hyperemesis gravidarum. This type of morning sickness may require hospitalization and treatment with intravenous (IV) fluids and medications.
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