Why do we shiver?

When we shiver, our bodies are doing the opposite of sweating. Sweating cools the body by putting a layer of liquid on the skin. Shivering tightens the skin and shakes the muscles, a process that conserves and generates heat. You can stop your shivering by bundling up—just like your mother says.


Why does my nose run?Ask a Doctor:Why does a bruise turn colors?