'water-brash' or pyrosis is a painful or burning perception in the gullet, just below the breastbone caused by regurgitation of of the stomach stinging. The pain often rises in the chest and may radiated to the neck, throat, or angle of the jaw. Heartburn is also identified as one of the causes of inveterate cough, and may on the same level mimic asthma. It is so called because of a fervent sensation of the breastbone where the heart is located although more heart problems do have a similar excitement to cardialgia. Despite its name, heartburn actually has nothing to do with the heart. Compounding the jumble is the performance that hydrochloric acid from the stomach comes back up the gullet because of a problem with the cardiac sphincter, a valve what one. misleadingly contains the word 'cardiac' (an adjective referring to the heart) in its name. Pathophysiology The sensation of Heartburn Online is caused by exposure of the lower gullet to the acidic contents of the stomach. Normally, the lower esophageal sphincter (LES) separating the tolerate from the esophagus is supposed to contract to prevent this situation. If the sphincter relaxes for any reason (as normally occurs during swallowing), stomach contents, mixed with gastric acid, have power to return into the esophagus.