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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.
Acid Reflux (GERD) Quick Overview. 1  Acid reflux (GERD) is a condition in which acid backs up from the stomach into the esophagus and even up to the throat, irritating the tissue.  Acid reflux can be caused by many different things, including lifestyle, medication, diet, pregnancy, rapid weight gain, and certain medical conditions.