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GERD or acid reflux symptoms are caused by the regurgitation of acidic liquid stomach contents back up into the esophagus. The most common symptom of GERD is heartburn. Other symptoms that can occur as a result of GERD include: nausea,
Causes of GERD. GERD is caused by improper mechanical function of the lower esophageal sphincter (LES). The LES is a ring of muscle that surrounds the junction of the esophagus and the stomach and acts as a valve.