Gastroesophageal reflux disease(GERD) refers to the reverse movement of gastric contents from the stomach or duodenum to the esophagus and produces symptoms,such as heartburn,and can cause RE and tissue damaging of extra -esophagus.It' s a common disease in western countries.The pathophysiolo -gical mechanism closely linked to the lower esophageal sphincter and distal esophageal body motility disfunction.For the past few years,clinical medical experts treat this disease through clinical experience an...