Morning sickness, also called nausea and vomiting of pregnancy (NVP), is a symptom of pregnancy that involves nausea or vomiting. The nausea usually starts around 6 weeks of pregnancy, but it can begin as early as 4 weeks. It tends to get worse over the next month or so. About half of the women who get nausea during pregnancy feel complete relief around 14 weeks. For most others, it takes another month or so for the queasiness to ease up, though it may return later or come and go throughout pregnancy.
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Nausea is a sensation of unease and discomfort in the upper stomach with an involuntary urge to vomit. It may precede vomiting, but a person can have nausea without vomiting.
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Vomiting, a.k.a throwing up or emesis, is the forceful expulsion of stomach contents. Human body uses vomiting to get rid of poisons and toxins that have been ingested. It can be caused by many reasons such as food that has gone bad, drinking too much alcohol, an allergic reaction to food, ingesting poison, motion sickness, bacteria or virus infection, etc.
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