[Allergic rhinitis frequently impairs bronchial function]

There is a clear connection between upper and lower airways. Allergic rhinitis may affect asthma by worsening natural history. Airways share similarities and differences such as: epidemiology, anatomy, physiology, immunopathology, and treatment. In asthmatic patients non-responder to conventional treatment, therapeutic success may be achieved only by recognizing and treating co-existent upper airways disorders. New therapeutical strategies should be based on a rational (i.e. considering the pathophysiology of the single patient) use of: antihistamines, antileukotrienes, and corticosteroids.