Acid Reflux Symptoms
Acid reflux, also known as gastroesophageal reflux disease (GERD), is a medical condition that occurs when the stomach acid flows back into the esophagus. The esophagus is the tube that carries food from the mouth to the stomach. Normally, a ring of muscle at the lower end of the esophagus called the lower esophageal sphincter (LES) prevents stomach acid from flowing backward.