Recently I have been experiencing involuntary gagging, which at times becomes so violent that I actually throw up. Sometimes it happens while I am smoking or drinking coffee and, others times the urge to gag is unprovoked. Initially I thought it was due to my smoking or perhaps drinking coffee on an empty stomach, but once it started to happen without those factors I became concerned. I am twenty four, and I am not pregnant, but my appetite is very unhealthy. I don't try to diet or starve myself but it is very common for me to go the whole day without eating, and sometimes when I do finally eat I get so full that I start gagging after I eat and sometimes during. Is it possible that my smoking and bad eating habits are the cause of my gagging or should I consider the fact that I may have throat/stomach cancer? Am I being a hypochondriac?