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Allergic rhinitis is associated with a symptom complex characterized by paroxysms of sneezing, rhinorrhea, nasal obstruction, and itching of the eyes, nose, and palate. It is also frequently associated with postnasal drip, cough, irritability, and fatigue [1-3].

The pathogenesis of allergic rhinitis is presented in this topic review. The clinical manifestations, diagnosis, and treatment of this condition are discussed separately. (See "Clinical manifestations and epidemiology of allergic rhinitis (rhinosinusitis)" and "Diagnosis of allergic rhinitis (rhinosinusitis)" and "Pharmacotherapy of allergic rhinitis".)