Gastroesophageal reflux disease (GERD) is a disease in which the contents of the stomach and duodenum flow back into the esophagus causing acid reflux, heartburn and other uncomfortable symptoms with or without damage to extra-tracheal tissues and organs such as the mouth, nasal cavity and respiratory tract. It is mainly caused by the reflux of refluxed material up the esophagus through the digestive tract, resulting in symptoms such as heartburn and acid reflux, and or refluxed material irritating the pharynx and respiratory tract, resulting in extra-esophageal complications such as asthma, pharyngitis, foreign body sensation in the pharynx, cough, nasal congestion and runny nose, chest pain and chest tightness. If a person often has bloating after eating, indigestion, a “hot” feeling in the chest, or chest tightness and shortness of breath after eating, then it is time to pay attention to his/her eating habits and whether he/she has reflux disease.