This article is a transcript.
Why do allergies make you sneeze? Well, it turns out when you have an allergy, it's because your body is mistaking something like pollen, or pet dander, for something dangerous, like a virus or bacteria.
And so what happens is if you get an allergen inside your nose, by breathing it in, your body releases histamine, which is a chemical that causes you to sneeze and get a runny nose to try to get that thing out because it thinks that thing is bad.
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