First, let's talk about the bodily functions that lead to vomiting. There are three phases to the vomiting act: nausea, retching, and expulsion. Vomiting is ordinarily preceded by nausea. It is not unheard of for a person to vomit without feeling nauseated, particularly in cases of sudden injury or sudden shock, such as witnessing an awful sight or breathing a particularly noxious smell. Vomiting that occurs suddenly and without warning is called precipitate vomiting. But most people experience nausea for a period of time before they vomit.

Answered by Deepthi , an ibibo Master, at 2:32 PM on December 01, 2008

Most phobics suffer terrible panic attacks when they have nausea or imagine that they do. These panic attacks are much worse for them than vomiting is for an ordinary person. Yet the act remains unthinkable. The phobia interferes with educations, careers, marriages, and family relationships. Many phobics take time away from work or school unnecessarily because they fear either vomiting themselves or being exposed to people who can pass germs that will cause them to vomit.
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Answered by Laxmikantha , an ibibo Master, at 2:42 PM on December 01, 2008

It is reflex given by the stomach the sensation goes to your bain and then the vagus nerve gets stimulated and makes us vomit ..

Answered by Clever , an ibibo Advisor, at 8:22 PM on December 01, 2008