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Pollen is the tiny egg-shaped male cells of flowering plants, including trees, grasses, and weeds. Pollen is microscopic in size.
Pollen is the most common cause of seasonal allergic rhinitis, sometimes known as "hay fever."
Plants that have powdery granules of pollen that are easily blown by the wind, such as:
Most flowering plants, such as roses, have heavier, waxy pollens that are not as easily wind-blown.
Each plant has a pollen season. It usually starts in the spring, but may begin as early as January in the southern areas of the US. The season usually lasts until November.
To lessen the effects of allergic rhinitis during pollen season, the American Academy of Allergy, Asthma, and Immunology suggests the following: