what is heartburn
For the novel, see Heartburn (novel) . Heartburn, also known as pyrosis, cardialgia, or acid indigestion, is a burning sensation in the chest, just behind the breastbone or in the epigastrium, the upper central abdomen. The pain often rises in the chest and may radiate to the neck, throat, or angle of the jaw.ymptoms of heartburn can be confused with the pain that is a symptom of an acute myocardial infarction and angina. A description of burning or indigestion-like pain increases the risk of acute coronary syndrome, but not to a statistically significant level.