Gastro Oesophageal Reflux Disease (GORD), gastric reflux disease, or acid reflux disease is defined as chronic symptoms or mucosal damage produced by the abnormal reflux of stomach acid to the esophagus. A typical symptom is heartburn.

This is commonly due to transient or permanent changes in the barrier between the oesophagus and the stomach. This can be due to incompetence of the lower oesophageal sphincter, transient lower oesophageal sphincter relaxation, impaired expulsion of gastric reflux from the oesophagus, or a hiatal hernia.

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