Pollen and Seasonal Allergies
Pollen is a major cause of both seasonal and perennial allergic rhinitis. Pollens are made up of tiny, egg-shaped cells, which are needed for plant fertilization. They can travel from many miles away, often becoming part of normal household dust. The most common types of pollens that cause allergic reactions include pollens from trees, grasses and ragweed. These plants create small light pollens that easily become airborne. Pollens from plants that contain colorful flowers seldom cause allergic reactions. Pollens from these plants are larger in size and are usually transported from plant to plant by insects.