What Causes GERD?
GERD occurs when a muscle at the lower end of the esophagus does not work properly. The muscle is called the lower esophageal sphincter (LES). Sphincters are ring-like bands of muscle that contract, or squeeze together, to close off body passageways. The body has many sphincters. Perhaps the most familiar is the anal sphincter, which seals off the rectum […]
