Morning sickness is nausea and vomiting that occurs during pregnancy. And, despite its name, morning sickness can strike at any time of the day or night.
Many pregnant women have morning sickness, especially during the first trimester. But some women have morning sickness throughout pregnancy.
Rarely, morning sickness is so severe that it progresses to a condition called hyperemesis gravidarum. This is when someone with nausea and vomiting of pregnancy has severe symptoms that may cause severe dehydration or result in the loss of more than 5% of pre-pregnancy body weight. Hyperemesis gravidarum may require hospitalization and treatment with intravenous (IV) fluids, medications and rarely a feeding tube.
Common signs and symptoms of morning sickness include nausea and vomiting, often triggered by certain odors, spicy foods, heat, excess salivation or — often times — no triggers at all. Morning sickness is most common during the first trimester and usually begins by nine weeks after conception. Symptoms improve for most expectant mothers by the mid to late second trimester.
The exact cause of morning sickness is unknown. Hormonal changes are thought to play a role in morning sickness. Rarely, severe or persistent nausea or vomiting may be caused by a medical condition unrelated to pregnancy — such as thyroid or liver disease.
Morning sickness can affect anyone who's pregnant, but it might be more likely if:
You had nausea or vomiting from motion sickness, migraines, certain smells or tastes, or exposure to estrogen (in birth control pills, for example) before pregnancy
You had morning sickness during a previous pregnancy
You're pregnant with twins or other multiples
Mild nausea and vomiting of pregnancy typically won't cause any complications to you or your baby.
If left untreated, severe nausea and vomiting can cause dehydration, an electrolyte imbalance, decreased urination and hospitalization.
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*These statements have not been evaluated by the FDA. Vitamin supplementation is for wellness only, and not intended to cure or treat disease.