A person with frostbite on the arms or legs may also have hypothermia (lowered body temperature). Check for hypothermia and treat those symptoms first.

Take the following steps if you think someone might have frostbite:

In case of frostbite, DO NOT:

• Thaw out a frostbitten area if it cannot be kept thawed. Refreezing may make tissue damage even worse.
• Use direct dry heat (such as a radiator, campfire, heating pad, or hair dryer) to thaw the frostbitten areas. Direct heat can burn the tissues that are already damaged.
• Rub or massage the affected area.
• Disturb blisters on frostbitten skin.
• Smoke or drink alcoholic beverages during recovery as both can interfere with blood circulation.

Frostbite is damage to the skin and underlying tissues caused by extreme cold. Frostbite is the most common freezing injury.

Cold exposure - arms or legs

Frostbite occurs when the skin and body tissues are exposed to cold temperature for a long period of time.

You are more likely to develop frostbite if you:

• Take medicines called beta-blockers
• Have poor blood supply to the legs (peripheral vascular disease)
• Smoke
• Have diabetes
• Have Raynaud phenomenon

Symptoms of frostbite may include:

• Pins and needles feeling, followed by numbness
• Hard, pale, and cold skin that has been exposed to the cold for too long
• Aching, throbbing or lack of feeling in the affected area
• Red and extremely painful skin and muscle as the area thaws

Very severe frostbite may cause:

• Blisters
• Gangrene (blackened, dead tissue)
• Damage to tendons, muscles, nerves, and bone

Frostbite may affect any part of the body. The hands, feet, nose, and ears are the places most prone to the problem.

• If the frostbite did not affect your blood vessels, a complete recovery is possible.
• If the frostbite affected the blood vessels, the damage is permanent. Gangrene may occur. This may require removal of the affected body part (amputation).

Call your health care provider if:

• You had severe frostbite
• Normal feeling and color do not return promptly after home treatment for mild frostbite
• Frostbite has occurred recently and new symptoms develop, such as fever, general ill-feeling, skin discoloration, or drainage from the affected body part

Be aware of factors that can contribute to frostbite. These include extreme:

• Wet clothes
• High winds
• Poor blood circulation. Poor circulation can be caused by tight clothing or boots, cramped positions, fatigue, certain medicines, smoking, alcohol use, or diseases that affect the blood vessels, such as diabetes.

Wear clothing that protects you well against the cold. Protect exposed areas. In cold weather, wear mittens (not gloves); wind-proof, water-resistant, layered clothing; 2 pairs of socks; and a hat or scarf that covers the ears (to avoid heat loss through the scalp).

If you expect to be exposed to the cold for a long period of time, do not drink alcohol or smoke. Make sure to get enough food and rest.

If caught in a severe snowstorm, find shelter early or increase physical activity to maintain body warmth.

Freer L, Handford C, Imray CHE. Frostbite. In: Auerbach PS, Cushing TA, Harris NS, eds. Auerbach's Wilderness Medicine. 7th ed. Philadelphia, PA: Elsevier; 2017:chap 9.

Sawka MN, O'Connor FG. Disorders due to heat and cold. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 101.

Zafren K, Danzl DF. Accidental hypothermia. In: Walls RM, Hockberger RS, Gausche-Hill M, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 9th ed. Philadelphia, PA: Elsevier; 2018:chap 132.

Zafren K, Danzl DF. Frostbite and nonfreezing cold injuries. In: Walls RM, Hockberger RS, Gausche-Hill M, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 9th ed. Philadelphia, PA: Elsevier; 2018:chap 131.