00:00Why do you shiver when it's cold? It's your body's way of doing everything it
00:03can to keep you alive. Shivering is actually one of the body's oldest
00:07survival tricks to keep you warm. When temperatures drop, your brain detects
00:10that you're losing heat and it reacts fast. First, your blood vessels tighten
00:14to keep your warmth near your vital organs, but if that isn't enough, your
00:18brain flips a switch and you start shivering. Shivering is a series of rapid
00:22involuntary muscle contractions that actually create heat, so your body is
00:26literally turning motion into warmth. It's working to protect your core
00:30temperature, especially your brain and your heart. Shivering can also be a
00:34warning sign. If the cold continues and energy runs low, shivering can slow or
00:38stop, which can be dangerous because heat production drops. So when you shiver, it's
00:43not just discomfort, it's your body fighting back.
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