I have a very interesting question to ask. Usually I have observed that people who get gastritis after taking painkiller also have nausea/vomiting at same time. Sometimes after alcoholic intake also, there is burning in stomach along with vomiting. In case of a food bug, the concept is clear that body tries to get ride of infection in stomach , hence vomiting occurs. So on one hand we give ppi, domperidon medication for control of symptoms but also need to give ofloxacin to get rid of infection as control of symptoms doesn't get ride of infection which is still there in the stomach. . But I want to know that in case of viral gastritis, alcohol induced, nsaid induced gastritis, the vomiting which happens is body mechanism to flush out the nsaid, alcohol contents.??.or it is the underlying gastritis itself which gives rise of reflux of contents including vomiting. Thanks doc.