Heartburn or pyrosis is a painful and burning sensation in the esophagus, just behind the breastbone mostly associated with regurgitation of gastric acid (gastric reflux). The pain often rises in the chest and may radiate to the neck, throat, or angle of the jaw. Heartburn is a major symptom of gastroesophageal reflux disease; acid reflux is also identified as one of the causes of chronic cough, and may even mimic asthma.Despite its name, heartburn in reality has nothing to do with the heart; it is so called because of a burning sensation next to to where the heart is located although several heart problems may give rise to a related burning sensation. Compounding the confusion is the actuality that hydrochloric acid from the stomach comes back up the esophagus because of a problem with the cardiac sphincter, a valve which misleadingly contains the word "cardiac," referring to the cardia as part of the stomach and not, as might be thought, to the heart.
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