Heartburn and Indigestion. One reaction to gluten sensitivity is an increase of acid in your stomach, causing heartburn, indigestion and related pressure in the upper stomach/chest. It can be really painful and it’s a sign that your body is under stress and NOT into whatever you’re consuming. And that “what” could be gluten. Please “like” or “share” if you can relate, or know someone who can relate, to heart burn as a symptom of gluten intolerance or Celiac Disease. Help us spread awareness! (original post by Lauren Lucille)