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Why do some people experience severe seasonal allergies while others have zero symptoms?

When spring arrives, my nose flows like water and my eyes swell from tree pollen, but my sibling feels perfectly fine. What causes this immune system mistake?

M
MedInfo
asked 1mo ago · 10 rep

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Allergies occur when an overactive immune system misidentifies harmless airborne plant pollen proteins as dangerous foreign invaders, triggering a massive release of inflammatory histamines throughout the body.

I
Immunologist answered 1mo ago

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