Characterized by sneezing; rhinorrhea; obstruction of the nasal passages; conjunctival, nasal, and pharyngeal itching; and lacrimation, all occurring in a temporal relationship to allergen exposure. Prevalence in North America is ~20% with a peak prevalence ~40% occurring in childhood and adolescence. Perennial allergic rhinitis occurs in response to allergens that are present throughout the year such as house dust (containing dust mite antigens) and animal danders.
Section 12. Allergy, Clinical Immunology, and Rheumatology