Rumination is a phenomenon characterized by retrograde flow of gastric contents into the mouth, otherwise known as regurgitation. Repetitive excessive occurrence of rumination is considered pathologic and is known as the rumination syndrome. Belching occurs occasionally in everyone and is often not related to a disease or a pathologic condition. Gastric belches are physiologic events caused by retrograde flow of air into the esophagus and mouth; however, supragastric belching is associated with belching disorders and is considered pathologic behavior.