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lower esophageal sphincter (les)

the lower esophageal sphincter (les) is a ring of muscle that forms a valve at the lower end of the esophagus where it joins the stomach.

the les stays closed except during swallowing, when it allows food to pass from the esophagus into the stomach. when the les is closed, it prevents the backflow (reflux) of stomach acid into the esophagus. if the les does not close tightly enough, stomach acid backs up into the esophagus, causing heartburn. a weak lower esophageal sphincter is a major cause of gastroesophageal reflux disease (gerd).

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this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use and privacy policy. to learn more about healthwise, visit healthwise.org. © 1995-2022 healthwise, incorporated. healthwise, healthwise for every health decision, and the healthwise logo are trademarks of healthwise, incorporated.

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