Heartburn: Causes, Symptoms, and Relief - A Comprehensive Guide

The burning sensation due to irritation caused by stomach acid backing up in the esophagus is called heartburn. It is a common condition that can occur when the lower esophageal sphincter (LES), a muscle that acts as a valve between the stomach and esophagus, does not close properly, allowing stomach contents to flow back into the esophagus. This can cause a burning sensation, pain, and discomfort in the chest and throat.