Introduction to Gastric Reflux Gastric reflux, commonly referred to as gastroesophageal reflux disease (GERD), is a chronic condition where stomach acid flows back into the esophagus, leading to irritation and discomfort. This backflow, or reflux, occurs when the lower esophageal sphincter (LES) – a ring of muscle that acts as a valve between the esophagus and stomach – does not close properly or opens too frequently. The persistent exposure of…