Male and female subjects ages 18 or older

Presenting to the Vanderbilt GI outpatient clinic with symptoms of GERD

Undergoing upper endoscopy and wireless pH monitoring (standard of care)

Erosive disease: presence of esophageal mucosal injuries documented

Non-erosive disease: normal esophagogastroduodenoscopy (EGD) with symptoms

Control group: normal subjects without symptoms of GERD

Can We Predict Who Has Gastroesophageal Reflux Disease (GERD)?