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Nausea and vomiting are not conditions themselves - rather, they are non-specific symptoms. Nausea describes a feeling of unease in the stomach, chest or throat. Someone experiencing nausea will usually feel the urge to vomit, but vomiting will not necessarily occur. Vomiting (emesis) is the physical act of forcibly ejecting stomach contents through the mouth. This may be a voluntary or involuntary action. Vomiting may occur independently of nausea.
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