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What causes heartburn?
The esophagus (the tube that connects your mouth to the stomach) has a tight
band of muscles at the lower end (lower esophageal sphincter [LES]) that closes after
the food enters the stomach and prevents the stomach contents to reenter the
esophagus. If this sphincter weakens or relaxes at the wrong time, stomach acid
can back up into the esophagus, causing heartburn.