Gastroesophageal reflux disease (GERD) is associated with a variety of extraesophageal symptoms including asthma, chronic cough, laryngeal disorders, and various ENT symptoms. Recent studies suggest that GERD underlies or contributes to chronic sinusitis, chronic otitis media, dental erosion, and obstructive sleep apnea syndrome (OSAS). In this article, we review the prevalence, diagnosis, and treatment of extraesophageal symptoms and including Montreal definition, a new definition and classification of GERD by an International Consensus Group.