Types of rhinitis.

Rhinitis is a familiar disorder affecting up to 20% of the general population. Chronic rhinitis can be broadly classified into allergic, infectious, or nonallergic or noninfectious, which are distinguished mainly by a careful history and allergy testing. The pathophysiology of nonallergic rhinitis likely involves a combination of inflammatory and neurogenic mechanisms that are poorly understood. Treatment involves avoiding the offending agent, when possible, and using appropriate medications to control the patient's predominant symptoms.