What is GERD and How to Fix It Gastroesophageal reflux disease (GERD) is a chronic condition characterized by the backward flow of stomach acid into the esophagus, causing heartburn, chest pain, and difficulty swallowing.
According to the American Gastroenterological Association, approximately one in five adults in the United States experiences some form of GERD.
What Is GERD and Its Causes GERD occurs when the lower esophageal sphincter (LES), a ring like muscle separating the esophagus and stomach, fails to function properly.