The surprising reason you feel awful when you’re sick – Marco A. Sotomayor

What actually makes you feel sick? Discover how your immune system and proteins called cytokines respond to infections.

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It starts with a tickle in your throat that becomes a cough. Your muscles begin to ache, you grow irritable, and you lose your appetite. It’s official: you’ve got the flu. It’s logical to assume that this miserable medley of symptoms is the result of the infection coursing through your body — but is that really the case? Marco A. Sotomayor explains what’s actually making you feel sick.

Lesson by Marco A. Sotomayor, animation by Henrik Malmgren.

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