Acid reflux occurs when the acid and contents in the stomach back up into the esophagus and the mouth. Sounds gross. It feels even worse. It is officially called gastroesophageal reflux disease (GERD), and those who suffer from it experience a burning sensation in the chest (often called heartburn) and irritation of the esophagus. There are no hard and fast rules as to which foods cause reflux, and people have different triggers. This presents the most common triggers of this undesirable condition.