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Heartburn is discomfort or actual pain caused by digestive acid moving into the tube that carries swallowed food to your stomach (esophagus). Typical features of heartburn include: A burning sensation starting in the upper abdomen and moving up into the chest.
Causes of Heartburn. To digest food, the stomach is flooded with acid. Between the stomach and the esophagus is a sphincter muscle that lets the food get to the stomach but then closes to keep the stomach acid from flowing back up the throat.