The condition known as acid reflux occurs when the lower esophageal sphincter malfunctions, allowing stomach fluid into the esophagus.

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Acid reflux occurs when the lower esophageal sphincter (LES) fails to close properly, allowing stomach acid and other contents to flow back up into the esophagus. This can cause a burning sensation in the chest known as heartburn, as well as other symptoms such as regurgitation, difficulty swallowing, and a sour taste in the mouth.

The Condition Known as Acid Reflux Occurs When the Lower