Heartburn

n. burning sensation in the stomach or chest area caused by indigestion

This article is about the medical condition. For the film see Heartburn (film). Heartburn or pyrosis is a painful or burning sensation in the esophagus, just below the breastbone  caused by regurgitation of gastric acid. The pain often rises in the chest and may radiate to the neck, throat, or angle of the jaw. Heartburn is also identified as one of the causes of chronic cough, and may even mimic asthma.
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(n.)
An uneasy, burning sensation in the stomach, often attended with an inclination to vomit. It is sometimes idiopathic, but is often a symptom of often complaints.
  

Heartburn has nothing to do with the heart. It is an uncomfortable feeling of burning and warmth occurring in waves rising up behind the breastbone (sternum) toward the neck. It is usually due to gastroesophageal reflux, the return of stomach acid back up into the esophagus, the soft tube-like portion of the digestive tract connecting the pharynx with the stomach.

Noun
1. a painful burning sensation in the chest caused by gastroesophageal reflux (backflow from the stomach irritating the esophagus); symptomatic of an ulcer or a diaphragmatic hernia or other disorder
(synonym) pyrosis
(hypernym) symptom