When the stomach contents such as food or liquid that consist of gastric acid leak backwards from the stomach into the esophagus (the tube from the mouth to the stomach). This is call acid reflux or in medical term Gastroesophageal reflux disease.
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Bile reflux is a condition in which bile backs up into the stomach and esophagus. Bile reflux is often confused with acid reflux, but there are differences between the two conditions, which frequently occur together.