Why Do Humans Shiver When They're Cold?

Shivering is when your body shakes to keep you warm. When it's cold, your muscles start moving really fast, even if you're not doing anything. This helps your body make more heat so you don't get too chilly. It's like when you run in place on a cold day, it warms you up!

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Examples

When you're outside on a chilly day, your body starts shaking to make heat.
After coming out of the water from a cold lake, your legs start shivering.
A baby wrapped in a blanket still shakes when it's too cold.

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Categories: Health · body mechanics· cold weather· thermoregulation· physiology