Abnormal growth of cells in the lower portion of the esophagus bordering the stomach. This disorder is caused by chronic heartburn and reflux and in rare cases, may lead to esophageal cancer. Oftentimes the symptoms associated include difficulty swallowing, pain under the sternum, frequent and longstanding heartburn, and occasional blood in vomit. .To check for Barrett’s an Endoscopy is performed, and biopsies may be obtained from the damaged area.
View Barrett's Esophagus Wiki