Do Onions and Bell Peppers Cause Heartburn? | Livestrong.com
Raw onions, in particular, have been known to lower the pressure of the lower esophageal sphincter, the muscle that keeps food from flowing back into the esophagus. In addition, raw onions are known as carminatives, a class of foods rich in volatile oils that includes peppermint and garlic, and that can produce heartburn symptoms in many people.
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