What Is Acid Reflux Disease? At the entrance to your stomach is a valve, which is a ring of muscle called the lower esophageal sphincter (LES). Normally, the LES closes as soon as food passes through it. If the LES doesn't close all the way or if it opens too often, acid produced by your stomach can move up into your esophagus.
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Gastroesophageal reflux disease ( GERD), gastro-oesophageal reflux disease ( GORD), gastric reflux disease, or acid reflux disease is a chronic symptom of mucosal damage caused by stomach acid coming up from the stomach into the esophagus.
You know about heartburn, of course. But did you know that persistent bouts may point to a disease called GERD?
