Vomiting can have causes that aren’t due to underlying disease. Examples include hangover, pregnancy, overeating or motion sickness.
Vomiting is rarely painful, but never pleasant. Vomiting, also known scientifically as “emesis” and colloquially as throwing up, retching, heaving, hurling, puking, tossing, or being sick, is the forcible voluntary or involuntary emptying of stomach contents through the mouth or, less often, the nose.
There are different types of vomiting. Some people get the dry heaves, where you retch and feel like vomiting, but nothing comes out of your stomach. The dry heaves are also called nonproductive emesis.

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