Pollen grains from trees, grasses, and weeds, as well as mold spores, cause seasonal allergies. When people directly inhale these allergens or come into contact with the eyes or skin, they trigger an immune response, leading to allergy symptoms.
Pollen grains from trees, grasses, and weeds, as well as mold spores, cause seasonal allergies. When people directly inhale these allergens or come into contact with the eyes or skin, they trigger an immune response, leading to allergy symptoms.