The primary objective of this study is to determine the accuracy of the Reflux Disease Questionnaire (RDQ) as a diagnostic test for gastroesophageal reflux disease. Symptom evaluation by the RDQ will be compared with other established approaches to the diagnosis of gastroesophageal reflux disease (GERD) in a primary care patient population with symptoms thought to be of upper gastrointestinal (GI) tract origin.

Inclusion Criteria:

• Subjects who seek medical advice at their family doctor (primary care physician) for symptoms thought by the primary care physician to arise from the upper GI tract
• The symptoms thought to pertain to the upper GI tract must have been present for at least 4 weeks prior to Visit 1 and to have occurred at least twice a week during that period
• The symptoms thought to pertain to the upper GI tract must have been of at least mild severity for a minimum of 3 days during the week prior to Visit 1

Exclusion Criteria:

• Upper GI endoscopy performed within a year prior to Visit 1
• Previous anti-reflux surgery, surgery for peptic ulcer or any form of upper gastrointestinal resective surgery
• Contra-indication to the Bravo™ procedure such as subjects with a history of bleeding diathesis, strictures anywhere along the GI-tract, esophageal varices, obstructions, or subjects equipped with a pacemaker, an implantable cardiac defibrillator or an implantable neurostimulator (NB: subjects with severe esophagitis (grade D) confirmed by endoscopy at Visit 2 can continue the study without performing the Bravo™ procedure)