What’s the Difference Between Acid Reflux and GERD?


What Is Heartburn?

After you swallow food, it makes its way down the esophagus and into the stomach, where a ring of muscle, called the lower esophageal sphincter (LES), closes to keep the food in. But sometimes the LES is weak or doesn’t properly close, allowing stomach contents to back up, which irritates the lining of the esophagus. That’s acid reflux, or heartburn.


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