Some pictures are worth a thousand words. This might be worth a few less.
Body temperature drops by 1–2 °C (1.8–3.6 °F) below normal temperature (down to 35–37 °C or 95–98.6 °F). Mild to strong shivering occurs.[3][4] The victim is unable to perform complex tasks with the hands; the hands become numb. Blood vessels in the outer extremities constrict, lessening heat loss to the outside air. Breathing becomes quick and shallow. Goose bumps form, raising body hair on end in an attempt to create an insulating layer of air around the body (which is of limited use in humans due to lack of sufficient hair, but useful in other species). Victim may feel sick to their stomach, and very tired. Often, a person will experience a warm sensation, as if they have recovered, but they are in fact heading into Stage 2. Another test to see if the person is entering stage 2 is if they are unable to touch their thumb with their little finger; this is the first stage of muscles not working. They might start to have trouble seeing. (Courtesy of Wikipedia)
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