Abstract
Gastroesophageal reflux disease (GERD) is defined on the clinical symptoms and pathophysiology of the disease. Therefore, endoscopic study has a subsidiary role in the diagnosis of GERD. The information obtained by endoscopic study, however, is pivotal for finding other disease than GERD that may cause reflux-like symptoms, for understanding pathophysiology of reflux disease by grading esophageal mucosal lesions, and for identifying Barrett's esophagus and assessing the therapeutic effect on it after the endoscopic or medical treatment. Therefore, the purpose of the endscopic study should be well recognized by all the endoscopists before doing study on each patient with different problems. Gastroenterological Endoscopy
