Acid reflux: A common condition and an abnormal one in which acid in the stomach rises up into the esophagus. This occurs because the valve separating the contents of the stomach from the esophagus does not function properly. See also: GERD. SLIDESHOW Digestive Disorders: Common Misconceptions See Slideshow From Heartburn Resources How EoE Affects Your BodyEOE Challenges7 Tips to Help You Fight Heart Failure Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19
