Cold hands

Gloves and health
Your bloodstream keeps your skin and hand tissues constantly warm. Blood reaches the right temperature by using energy from the nutrients your cells burn. This process requires a constant supply of nutrients and oxygen.
Body temperature may drop when the body loses heat through the skin in cold weather, when circulation is restricted, or when the supply of nutrients and oxygen decreases. The risk of damage caused by cold increases if your diet is inadequate, or if you are at high altitudes with insufficient oxygen in the air.
Frostbite can usually be prevented by covering the skin, fingers, toes, ears and nose, and only exposing these parts of the body to cold air for short periods of time. If the body is exposed to low temperatures for extended periods of time, the smaller vessels in the skin, fingers, ears and nose narrow in order to save heat for the major organs, the brain and the heart. As a result, the parts of the body with limited circulation cool down more quickly.
In order to avoid cold injury, you must be informed and prepared. Multi-layer clothing, especially if made of natural wool, or lined with feathers or synthetic fiber, a hood, and a windbreaker jacket should give suitable protection in extreme weather conditions. You can lose a lot of your body temperature through the skin on your head, therefore a warm cap is essential. Your chances to prevent cold injury improve if you are well fed and adequately hydrated.
Frostbite is a lasting injury caused by exposure to cold, and may affect several body parts.
Arteriosclerosis, circulation problems caused by arteritis, or any kind of blood vessel disturbance, whether attributed to smoking, neurological conditions, or drug treatment, may increase the damage done by cold. Tight gloves and boots are also dangerous, because they restrict circulation. The greatest risk is to leave hands and feet uncovered. The damaging effect of frostbite is due to reduced circulation and the formulation or crystallized ice.