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Heartburn »

Overview of Heartburn

The esophagus is a tube that connects the mouth to the stomach. It is made of muscles that work to push food toward the stomach in rhythmic waves. Once in the stomach, food is prevented from refluxing (moving back into the esophagus), by a special area of circular muscle located at the junction of the esophagus and stomach, called the lower esophageal sphincter (LES). A pressure difference across the diaphragm, the flat muscle that separates the chest from the abdomen, also tends to keep stomach contents in the stomach.

The stomach combines food, acids, and enzymes together to begin digestion. There are special protective cells that line the stomach to prevent the acid from causing inflammation. The esophagus does not have this same protection; if stomach products reflux back into the esophagus, they can cause inflammation to the lining.

Heartburn Causes

Heartburn is actually a symptom of G...

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