Vomiting (also known as puking, throwing up, barfing, emesis, among other names) is the involuntary, forceful expulsion of the contents of one's stomach through the mouth and sometimes the nose.Vomiting can be caused by many conditions; it may be present as a specific response to ailments like gastritis or poisoning, or as a non-specific sequela ranging from brain tumors and elevated intracranial pressure to overexposure to ionizing radiation. The feeling that one is about to vomit is called nausea; it often precedes, but does not always lead to vomiting. [Source: Wikipedia 
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