An allergen is a substance in the environment that causes an allergic reaction in some people.
Sometimes called "common" ragweed, short ragweed is native to North America. It produces large amounts of pollen that stay airborne. The plant generally blooms in late summer and fall.†
†Ragweed pollen season varies regionally.
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People with allergies can be sensitive to many different allergens. Taking note of the time of year when you experience allergy symptoms and where you experience them can help you and your allergy specialist figure out if you may be allergic to ragweed pollen.