Introducing DAILY GERD ACID REFLUX DIET Apps. It was created to help patient with Gastroesophageal Reflux Disease (GERD), also known as acid reflux, or chronic heartburn, is a long term condition where stomach contents come back up into the esophagus resulting in either symptoms or complications. Acid reflux is the flow of stomach acid back into the esophagus. A common symptom is heartburn - a burning discomfort felt anywhere from the stomach up into the chest and throat.