30 Foods That Cause Acid Reflux
Raw Onions

It may seem normal to top your salad or burger with raw onion, but if you have acid reflux, you should stay away from this vegetable. Raw onions can increase the number of reflux episodes as well as the frequency of belches you may experience.
Onions are a double-hitter. First, the onions lower the esophageal sphincter. In addition to that, they're high in fermentable fiber, which promotes even more acid reflux.