Reflux is a malfunction of the esophagus-stomach-system and indicates that fluids are going in a reverse direction from the stomach back into the esophagus – and may go all the way up to the larynx (laryngopharyngeal reflux – LPR). Stomach fluids are mostly acidic, contain pepsin, attack the mucosa and thus may be felt in the upper airway causing a great variety of symptoms like soreness of thraot, and may induce throat clearing, coughing and hoarseness.