When you’re in the cold, your body will conserve heat in it’s core by reducing blood flow and therefore warmth in the extremities, including your hands. This is known as ischemia, and because the hands are getting less oxygen, they react as if injured and release singals that cause inflammation and pain. While you are in the cold, you probably won’t feel very much of this because your hands are numb. But as they warm up again, the pain signals get through to the brain, intensified by the throbbing of blood returning to the hands.
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