Allergic rhinitis is the most common of the atopic diseases. It occurs in approximately 15% of the general population and may exist alone or in combination with asthma or atopic dermatitis.[1] In children, allergic rhinitis is relatively uncommon before the age of 3 years and increases in frequency thereafter, reaching a peak prevalence in adolescence. The most easily recognized form of allergic rhinitis occurs in a typical seasonal pattern, referred to as seasonal allergic rhinitis or hay fever. Year-round, or perennial, allergic rhinitis, which is triggered by indoor allergens such as dust mites or animal dander, is more common but often less dramatic and therefore more difficult to diagnose.