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One such cause of GERD is a hiatal (or hiatus) hernia. This is an anatomical abnormality where a hole in the diaphragm allows the upper part of the stomach to enter the chest cavity, sometimes leading to GERD. Pregnancy is also sometimes a cause of acid reflux due to extra pressure being placed on the internal organs.
Gastroesophageal Reflux Disease (GERD) is caused by reflux of stomach acid into the esophagus. In most sufferers this is due to a relaxation of the lower esophageal sphincter (LES) that opens to allow food and liquids to pass into the stomach, and closes to prevent food and stomach acid from flowing back into the esophagus. This relaxation of the LES happens a few times each day in people without GERD.