For ERD(erosive reflux disease), which pathogenesis is mainly the acid reflux mechanism, primary treatment is therefore PPI. However, NERD(non-erosive reflux disease) is much more complex than ERD and there are more factors causing the typical symptoms. As a result, there is no consensus for the treatment of NERD besides using PPI similar to GERD(gastroesophageal reflux diseas). This study intent to evaluate the effect of PPI(Esomezol) on NERD patients and analyze the improvement of symptoms and the factors related to the result.

(1) Among GERD patients, EGD(esophagogastroduodenoscopy) must be done before 6 months and must prove there is no erosive lesion. (2) During EGD, esophagus mucosa histology will be taken for evaluation. (3) For NERD patients, Esomezol is given once a day (before breakfast meal), for whole 8 weeks. (4) PAGI-SYM and HAD-K is evaluated and score just before the administration of PPI, 4weeks after and 8weeks after the study initiation.

Inclusion Criteria:

• Patient over 19 years old
• Patient with typical GERD symptom (heartburn or acid reflux more than once a week)

Exclusion Criteria:

• Patient who received EGD since the past 6 months, and diagnosed as GERD endoscopically
• Patient with active gastric/duodenal ulcer
• Patient who received esophagus, stomach or duodenum surgery
• Patient with hypersensitivity to esomezol®
• Patient with no achieved agreement on the study from the guardian or patient himself.