What is heartburn and gastroesophageal reflux disease (GERD): the symptoms and diagnosis
Heartburn is the abnormal condition that stomach acid flows back into esophagus, the muscular tube from the mouth to the stomach. In normal conditions, there is a muscular valve at the bottom of the esophagus called the lower esophageal sphincter (LES) that keeps substances [...] http://digg.com/u1MVi9
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