GERD is a chronic digestive disorder where stomach acid flows back into the esophagus, leading to irritation and discomfort. This condition commonly results in symptoms such as heartburn, regurgitation, and chest pain. GERD occurs due to a weakened or malfunctioning lower esophageal sphincter. If left untreated, it can cause complications like esophagitis, strictures, or Barrett’s esophagus, requiring long-term lifestyle changes or medical management.