
| Environmental Factors: Seasonal allergic rhinitis (hayfever) is associated with inhalant pollen allergens from: -- trees in the spring -- grass and weeds in the summer -- ragweed in the fall Perennial allergic rhinitis is caused by: -- dust mites -- cockroaches -- molds -- animal dander Aggravating irritants include: -- tobacco smoke -- climatic changes (eg, cold weather) -- air pollution -- fires -- perfumes -- strong odors Genetic Considerations: There is a strong genetic predisposition for allergic rhinitis with a family history of: -- atopic dermatitis -- asthma -- allergic rhinitis |