H. Pylori is a common bacteria that can cause that, I recently had this myself and had to go on 2 rounds of biaxin for it. If you continue to have problems, mention H. Pylori to your doctor, if you do not seek treament, it can cause ulcers or stomach cancer. Coli is another bacteria that can cause stomach problems, but I doubt that is the problem. It could just be acid buildup who knows, better safe than sorry.