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Wikipedia definition
1. Morning sicknessMorning sickness, also called nausea gravidarum, nausea, vomiting of pregnancy (emesis gravidarum or NVP), or pregnancy sickness is a condition that affects more than half of all pregnant women. Related to increased estrogen levels, a similar form of nausea is also seen in some women who use hormonal contraception or hormone replacement therapy. Sometimes it is present in the early hours of the morning and reduces as the day progresses.
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