The science of seasonal allergies — and why they’re so awful - Vox: "Seasonal allergies are the immune system's response to the millions of pollen grains — plant sperm cells — floating through the air every spring. By incorrectly interpreting pollen as a health threat, your body triggers an inflammatory response, leading to annoying symptoms like itchy eyes or runny noses. This is known as allergic rhinitis, or "hay fever.""
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