Gastroesophageal Reflux Disease, or GERD, is another name for heartburn, which is a chronic condition. It occurs when the sphincter of the esophogus, going into the stomach, allows some stomach acid to rise into the esophogus, and irritate the tissue there. It is a very painful, damaging, condition.
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NO SUCH THING
hypertension
a group of numbers
Almost extinct
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