I take a prescription for Acid Reflux, and if not for that my diet would be missing a lot of things other than peppers. That's the kind of pain (esophageal) that I associate with being common with hot peppers, and that's what something like Tums or Mylanta will help with. If it's actually in your gut, that's when you start thinking about ulcers, or heaven forbid duodenum. Point is, like everyone's said: ask a doctor, it could be a myriad of things and speculation will only cause you to worry over something that probably has a simple solution.