What Causes Seasonal Allergies?
This condition is caused by an overactive immune system that responds to the allergen – usually the pollens. In the eastern, southern, and Midwestern United States, spring pollens usually come from trees (oak, elm, maple, alder, birch, juniper, and olive). In the early summer, pollens come from grasses (bluegrasses, timothy, redtop, and orchard grass).
In the late summer, pollens come from ragweed. Seasonal allergy is also caused by mold spores, which can be airborne for long periods of time during the spring, summer, and fall. Allergic conjunctivitis (a condition of the eye) may result when airborne substances, such as pollens, contact the eyes directly.
Tags: Seasonal Allergies, Seasonal Allergies causes
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