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Acid reflux refers to backflow of acid and digestive enzymes from the stomach into the oesophagus (food passage), pharynx (throat) and larynx (voice box). This usually occurs when the lower oesophageal sphincter is weak. This sphincter is a muscular valve which prevents backflow of stomach contents. Backflow into the oesophagus is known as gastroesophageal reflux (GERD) and...
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