Why Do We Shiver When Cold?

Have you ever felt cold and started to shake? That shaking is called shivering. It is your body's way of making heat.

When you are outside in the winter or step into a chilly room, tiny sensors in your skin feel the cold. They send a message to your brain, which acts like a thermostat. Your brain says, "It is too cold! We need more warmth!"

So, your muscles start to twitch and contract very quickly. These fast movements are not random; they work together to create friction. Just like when you rub your hands together to warm them up, your tiny muscle fibers rubbing against each other make heat.

As the heat builds up inside your body, it gets warmer again. Once your brain feels that things are comfortable, it sends a signal to stop the shaking. You feel less cold and can relax.