Gastroesophageal reflux disease (GERD) is defined as a decrease in the function of the barrier that prevents reflux, allowing the contents of the stomach to back up into the esophagus. This is an abnormality caused by weakened lower esophageal sphincter, gastric emptying dysfunction, or loss of esophageal motility. In some cases, endoscopic gastroesophageal reflux surgery is indicated for the patient.