This is a prospective, within-subject controlled study involving simultaneous dual placement of wireless Bravo pH probes in each participant. Patients will receive pH testing when symptomatic for gastroesophageal reflux disease (GERD) to confirm diagnosis as part of standard of care. Each test is 96 hours with a symptom diary, GERD-HRQL, and RSI collected, which is also standard of care for patients presenting with GERD symptoms.