What is the name of burning sensation due to irritation caused by stomach acid backing up in esophagus?

The burning sensation due to irritation caused by stomach acid backing up in the esophagus is called heartburn. It is a common condition that can occur when the lower esophageal sphincter (LES), a muscle that acts as a valve between the stomach and esophagus, does not close properly, allowing stomach contents to flow back into the esophagus. This can cause a burning sensation, pain, and discomfort in the chest and throat.

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