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Why do some people have hay fever and other seasonal allergies?

An informative animation from TED-Ed explains everything you need to know about seasonal allergies.

One in five people in the UK suffer from hay fever — an increased sensitivity to grass, tree and weed pollen. It causes sufferers to have itchy eyes, a runny nose and a countless amount of sneezing. But what exactly is happening and why are our bodies behaving in such a way?

Allow TED-Ed to explain…

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