This occurs when the upper part of the stomach and LES move above the diaphragm, a muscle that separates your stomach from your chest.
Normally, the diaphragm helps keep acid in our stomach. But if you have a hiatal hernia, acid can move up into your esophagus and cause symptoms of acid reflux disease.
Read More Here:
https://www.webmd.com/heartburn-gerd/guide/what-is-acid-reflux-disease#1
Video on Real Causes of Acid Reflux
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