Slideshow
The Most Common Allergies in the U.S.A.
Written by Amy Sandhu and Medically Reviewed by Scott Pearlman, M.D.
Pollen: 35 Million
Pollen, which is the most common allergen and the cause of hay fever, is released in the spring, summer, and fall. Although pollen's mission is to fertilize plants, many particles never reach their targets, but wind up instead in human throats and noses. Pollen counts, which measures the amount of pollen currently in the air, are available through many internet resources.
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