Also called GERD. A common disorder marked by frequent or severe heartburn. The burning feeling occurs when stomach acid flows up into the esophagus.
A backflow of stomach contents into the esophagus. This is often caused by incompetence of the lower esophageal sphincter.
a digestive disorder involving lower esophageal sphincter (LES) dysfunction, which allows acid to flow from the stomach back into the esophagus. See also acid reflux disease.