Q. Why do you shiver when you get cold?
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A. People shiver automatically when they get cold. The body has nerve cells that are sensitive to hot and cold and act as a thermostat. These nerve cells are sensitive to hot and cold and act as a thermostat. These nerve cells are found in the part of the brain called the hypothalamus, which is about the size of a cherry. When you get cold, these cells trigger a message that makes you start to shiver. The muscles in your body tighten up, and this helps produce heat. Shivering when you have a fever is caused by a substance in the white blood cells. When this chemical is released into the body, it changes the thermostat, forcing the body to get rid of heat.