Allergic rhinitis (hay fever)
Definition Allergic rhinitis (hay fever) is a reaction to airborne allergens. It affects between 1:6 and 1:10 Americans and is an IgE-mediated disorder of the immune system; 70% of cases occur before age 30. Symptoms resemble those of viral rhinitis but persist and show seasonal variation. This most common form of allergy involves the entire [...]



