15439 Frostbite

Overview

Frostbite is an injury caused by freezing of the skin and the tissues just beneath it. When skin is exposed to extremely cold temperatures, ice crystals can form inside the cells, which may damage or even destroy the affected tissue. The nose, ears, cheeks, chin, fingers, and toes are the most common areas to be affected.

Frostbite is not very common in everyday life, but it can happen anywhere that temperatures drop below freezing, especially with strong wind or wet conditions. It is more frequent in cold climates, at high altitudes, and among people who spend long periods outdoors in winter.

Anyone can get frostbite, but some people are more at risk. These include people with poor blood flow, diabetes, or nerve damage, older adults, young children, people who use alcohol or tobacco, and those who are unhoused or without proper winter clothing.

Symptoms

Common symptoms

• Numbness or loss of feeling in the affected area
• A cold, prickly, or tingling sensation
• Skin that looks pale, waxy, grayish-yellow, or unusually red
• Skin that feels hard or stiff to the touch
• Swelling, itching, or burning pain as the area warms
• Blisters may appear after rewarming, sometimes filled with clear or milky fluid

Symptoms in children

• Children may not complain about their skin feeling cold or numb, so watch for complaints of pain or discomfort instead.
• Their skin may become pale or red with a cold, hard patch.
• A child might cry, fuss, or seem unusually tired or grumpy in cold weather.

Symptoms in older adults

• Older adults may have reduced sensation in their hands and feet, so they might not notice frostbite developing.
• Frostbitten skin can be pale, cold, and painless rather than painful.
• Healing often takes longer in older adults, especially if they have other health conditions.

Causes

Main causes

• Exposure to freezing temperatures, especially below -1°C (30°F) with wind chill
• Direct contact with cold objects such as metal, ice, or wet clothing
• Wearing clothing that is not warm enough or becomes wet in cold, windy weather

Risk factors

• Being outdoors in cold conditions for a long time without proper protection
• High altitude, which increases the risk of cold injury
• Damp or windy weather that draws heat away from the skin
• Tight shoes or gloves that restrict blood flow
• Medical conditions that affect blood flow, such as diabetes, peripheral artery disease, or Raynaud's phenomenon
• Smoking or using other nicotine products, which constrict blood vessels
• Alcohol use, which can impair judgment and increase heat loss
• Certain medicines that affect circulation
• Age factors, such as being very young or very old

When to see a doctor

See a doctor urgently if:

• If you think you have frostbite and your skin is still hard, cold, or numb after rewarming.
• If the skin looks bluish, blackened, or has open blisters.
• If you have any signs of hypothermia like confusion, severe shivering, or slurred speech.
• If you have a medical condition such as diabetes or poor circulation and notice any cold or discoloured skin.

Book a routine appointment if:

• If you have had frostbite in the past and notice ongoing pain, sensitivity, or changes in skin colour.
• If you are not sure whether your symptoms are frostbite or a milder cold injury like frostnip.
• If you need advice on how to protect the affected area as it heals.

Diagnosis

A doctor will ask about your cold exposure and symptoms, then carefully examine the affected area to judge how deep the frostbite is. They will look at skin colour, temperature, feeling, and how the skin responds to pressure.

Tests that may be done

• A physical exam to check the affected area and look for signs of tissue damage
• A review of your medical history and any risk factors you may have
• In some cases, imaging tests such as an X-ray, bone scan, or MRI to check how deep the damage is and whether bone or muscles are involved
• Blood tests to check for infection or other problems if the frostbite is severe

What to expect at your appointment

The doctor will tell you how severe the frostbite is, from mild frostnip to deep frostbite. They will discuss treatment options and what you can do at home. They may recommend a follow-up visit to watch how the area heals, sometimes over several weeks.

Treatment

The most important steps are to get out of the cold and begin rewarming the affected area gently. Get to a warm place, remove any wet clothing, and place the frostbitten part in warm, not hot, water. Never rub the skin, use heating pads, or stand near a fire, because numb skin can easily burn.

Self-care at home

• Get out of the cold and remove any wet or tight clothing.
• Place the affected area in warm water, around body temperature, for 20 to 30 minutes.
• Avoid rubbing or massaging the area, and do not walk on frostbitten feet if possible.
• Raise the affected area to help reduce swelling.
• Keep the skin clean and dry, and cover it with a loose, sterile dressing.
• Take over-the-counter pain relief if needed, but always follow the directions on the package and ask your pharmacist if you are unsure.

Medical treatments

In a healthcare setting, doctors may gently rewarm the affected area in a warm water bath, give medicine to manage pain, clean the skin, and apply dressings. They may also give fluids through a vein if the patient is dehydrated or at risk of shock. In some cases, medicines that help improve blood flow or prevent infection may be used. It is important to note that the rewarming process can be painful, and doctors will help manage that discomfort safely.

When is surgery considered?

Surgery is only needed for severe frostbite where tissue has died. In these cases, doctors may need to remove dead skin or tissue, and sometimes amputation may be unavoidable. Surgery is usually delayed for several weeks to let healthy tissue show clear boundaries between what can heal and what cannot.

Living with this condition

While recovering from frostbite, protect the affected area from further cold and injury. Follow your doctor's advice about cleaning, dressing, and monitoring the wound. Avoid walking on frostbitten feet until they have healed. Keep the area clean and watch for any signs of infection such as increasing redness, swelling, warmth, or fever.

Lifestyle tips

• Dress warmly in layers and wear moisture-wicking clothing next to your skin.
• Wear insulated, waterproof boots and mittens instead of gloves to keep fingerstogether and warmer.
• Avoid smoking and secondhand smoke, as nicotine reduces blood flow.
• Limit alcohol, especially in cold weather, because it makes you lose heat faster and impair your judgment.
• Keep your extremities warm even indoors when your hands and feet feel cold.

Diet and exercise

Eating a healthy, balanced diet supports healing and helps keep your immune system strong. Drinking plenty of water is also important. Gentle exercise, as allowed by your doctor, can improve circulation, but avoid any activity that puts pressure on the healing area until it is fully recovered.

Mental health and emotional wellbeing

Frostbite can be emotionally distressing, especially if it causes pain, scarring, or changes in how you look or move. It is normal to feel anxious, sad, or frustrated. Talking to a trusted friend, family member, or mental health professional can help. Remember that recovery takes time, and support is available.

Prevention

Yes, frostbite is almost always preventable. The best way is to avoid prolonged exposure to freezing temperatures. When going outside in cold weather, dress in warm layers, cover your ears, face, nose, and hands, and keep your clothes dry. Pay close attention to wind chill, because strong wind can draw heat from your skin much faster. Stay hydrated and take regular breaks indoors if you are outside for a long time.

Complications

If left untreated

• Permanent numbness or tingling in the affected area
• Damage to nerves, blood vessels, or underlying tissues
• Infection that may spread to the whole body
• Gangrene, which is tissue death caused by lack of blood flow
• Amputation of fingers, toes, or other affected body parts

Long-term outlook

With prompt and proper care, most frostbite cases heal well and the affected area returns to normal within a few weeks. Even more serious cases can often be treated successfully, though some long-term sensitivity or numbness may remain. The key is to act quickly, follow medical advice, and take steps to protect the injured area while it heals. Many people recover fully and go on to live healthy, active lives.

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