This document discusses classifications of allergic rhinitis proposed by various groups from 1985 to 2001. It describes classifications based on etiology (allergic vs non-allergic), chronicity (seasonal vs perennial), and severity (intermittent vs persistent). The ARIA classification from 2001 divides rhinitis into intermittent or persistent, and further by severity as mild or moderate-severe based on sleep disturbance and impairment. Topical corticosteroids are highlighted as the most potent and effective treatment for moderate-severe persistent allergic rhinitis.