Heartburn. Computer artwork of stomach acid in the oesophagus, the tube that leads from the mouth to the stomach, the cause of heartburn. Heartburn causes a painful burning sensation in the chest and inflammation of the lining of the oesophagus. It can be caused by overeating, eating acidic or spicy foods, or drinking alcohol or caffeinated drinks. Treatment is with over-the-counter antacids.
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