Heartburn—What is Acid Reflux?

Acid reflux disease, also known as gastro-esophageal reflux disease, or GERD, occurs due to the coexistence of two medical conditions. The first acid reflux disease contributing condition is a retrograde flow of stomach contents into the esophagus. However, the reflux itself does not necessarily lead to gastro-esophageal reflux disease symptoms or histologic...