Occasionally I'll get these small, painful sores on the inside of my mouth (not cold sores). Usually it is after my stomach has felt yucky. I've heard that the sores are a response to having a virus of some sort. I had some lower GI problems a few days ago, and now I have a canker sore on my gum. Could I have had a mild bug? Does anyone else get these sores? I also thought that perhaps they result from acid reflux. I've gotten cavities from reflux, so why couldn't it burn my mouth, too? Any thoughts? Man, I hate these sores. Especially the little bumps on your tongue!