Frostbite and hypothermia: how to recognise them and give first aid

A crisp winter morning. Your friend has been out skiing for hours and comes back with pale, waxy patches on their cheeks and numb fingers. Or another scene: an elderly neighbour is found slumped on the doorstep after a night frost, drowsy, shivering uncontrollably, barely able to speak.

These are two very different situations — and that distinction is the heart of this article. The first is most likely frostbite: a localised cold injury to skin and underlying tissue. The second may be hypothermia, meaning a dangerously low core body temperature — a state of immediate danger to life. They can occur together, they both come from cold exposure, but they call for a completely different response.

Cold-weather injuries are more common than many people realise, and they are not limited to extreme mountaineering. They happen to runners caught in a sudden blizzard, to children playing outside too long, to homeless people and to anyone whose winter trip takes an unexpected turn. Knowing what you are dealing with and how to act can literally save a life. This article walks you through it step by step — clearly and without needless scare-mongering.

What happens when the body gets too cold?

The human body works hard to keep its core temperature at around 37 °C. In the cold, it does this mainly by constricting blood vessels near the skin to reduce heat loss — which is why fingers, toes, ears and the nose are the first areas to suffer. It also generates heat through shivering, a form of rapid involuntary muscle contraction.

When the cold overwhelms these defences, two distinct problems can develop:

• Frostbite — the freezing of tissue in specific body parts, most often extremities and exposed areas of the face. The core temperature stays normal or near-normal; the damage is localised.
• Hypothermia — the entire core temperature drops below 35 °C. Every organ, including the heart and brain, begins to malfunction. This is a systemic emergency.

Both can occur at the same time — a person with severe frostbite may also be hypothermic — but recognising which problem is dominant guides the first steps you take.

Frostbite — a localised cold injury

Frostbite happens when the tissue temperature drops so far that ice crystals form inside the cells. The process destroys cell walls and disrupts blood supply. The toes, fingers, heels, ears, nose and cheeks are at greatest risk.

Stages of frostbite

Frostbite is often described in stages of increasing severity:

• Frostnip (very early frostbite) — the skin looks pale or red and feels cold, numb or tingly. No ice crystals have formed yet; the tissue is not permanently damaged. Once you move indoors and warm up, sensation and colour return completely.
• Superficial frostbite — the skin surface has frozen but the deeper tissue remains soft. The skin looks white, waxy or greyish-yellow and feels hard to the touch, though the tissue underneath still gives slightly when pressed. After rewarming, blisters filled with clear or milky fluid may appear over 24–48 hours.
• Deep frostbite — the tissue is frozen all the way through, including muscle and sometimes bone. The skin is hard, wooden and cold; it may turn mottled, dark blue or black. There is often complete loss of sensation. Blisters, if they appear, contain bloody fluid. Deep frostbite can cause permanent tissue loss.

Typical signs to look for

• Skin that has gone unusually pale, waxy or yellowish-white
• Numbness or "pins and needles" in the affected area, sometimes followed by complete loss of feeling
• Skin that feels hard or woody to the touch
• Blisters (with clear or bloody fluid) appearing hours after rewarming
• The affected area may look normal at first but feels wrong — pay attention to complaints of numbness even when there are no obvious colour changes

A key observation: with frostbite the person is usually still conscious and orientated, because the core temperature is intact. If you notice confusion or drowsiness alongside frostbite signs, suspect hypothermia as well.

Hypothermia — a life-threatening condition

Hypothermia is defined as a core body temperature below 35 °C. As the temperature falls further, the heart rhythm becomes unstable, the brain fails, and without treatment the outcome can be fatal. It is an immediate danger to life and requires emergency medical care.

Stages of hypothermia

• Mild hypothermia (32–35 °C) — strong shivering, pale or bluish skin, numbness, clumsiness, slurred speech, difficulty thinking clearly. The person is still conscious.
• Moderate hypothermia (28–32 °C) — shivering may paradoxically stop (the body can no longer generate enough heat by shivering). The person becomes increasingly drowsy, confused and uncoordinated. Heart rate and breathing slow.
• Severe hypothermia (below 28 °C) — loss of consciousness, very slow and irregular pulse, very slow breathing or none at all. Cardiac arrest is a real risk. A person in severe hypothermia may appear dead but still be alive — do not give up on resuscitation until they have been warmed.

How to tell hypothermia from frostbite at a glance

Two features are decisive:

• State of consciousness. A conscious, orientated person with local cold injury — that is frostbite or frostnip without hypothermia. Confusion, drowsiness, slurred speech, loss of consciousness — these point to hypothermia.
• Pattern of the injury. Frostbite affects specific parts (fingers, toes, ears, nose). Hypothermia affects the whole body — the person feels globally unwell, cold all over, and their reactions are slowed.

A shortcut worth remembering: treat any cold-exposed person with altered consciousness as hypothermic and call emergency services immediately. Do not wait for it to "sort itself out".

First aid step by step

The response depends on what you are dealing with. Always start by assessing the state of consciousness of the affected person and moving them out of the cold.

For frostbite (conscious person, localised injury)

1. Move the person to a warm, sheltered environment as quickly as possible. Getting out of the wind and cold is the single most important step.
2. Remove wet or constrictive clothing from the affected area — wet gloves, tight boots, wet socks.
3. Rewarm gently with body heat — cup frostbitten fingers in your warm armpits, cover frostbitten ears with warm hands, wrap frostbitten toes against someone's warm abdomen. Warm water immersion (around 37–40 °C, not hotter) is effective if available.
4. Do not rub the affected area. Rubbing frostbitten tissue causes mechanical damage and can worsen the injury. Do not massage it.
5. Do not use dry heat — radiators, open fires, hairdryers, hot water bottles. Numb skin cannot feel heat properly and can easily be burned.
6. Do not rewarm if there is any chance of refreezing. Tissue that thaws and then refreezes suffers far greater damage than tissue that stays frozen until medical care is available. If the person must continue walking to safety, it may be safer to leave frostbitten feet frozen for now.
7. Protect blisters if they appear. Do not puncture them — they are a natural dressing. Cover them loosely with a clean, non-fluffy dressing.
8. Give warm drinks and something sweet if the person is fully conscious and can swallow — warm (not hot) sweet tea or soup helps the body rewarm from within. Do not give alcohol.
9. Seek medical attention for anything beyond frostnip. Superficial and deep frostbite need professional assessment, pain management and often specialist wound care.

If hypothermia is suspected

The person is confused, drowsy, barely responds or is unconscious. This is a life-threatening emergency. Every minute counts:

1. Call emergency services immediately (112 or local emergency number). This is the first and most important step — do not delay it.
2. Move the person out of the cold with great care. Handle them as gently as possible — rough movement in severe hypothermia can trigger dangerous heart rhythms.
3. Prevent further heat loss. Lay the person on an insulating surface (not cold ground), remove wet clothing if you can do so gently, and wrap them in blankets, sleeping bags or dry coats — cover the head as well, since a large proportion of heat is lost there.
4. Do not actively overheat the core. Apply gentle external warmth (warm blankets, someone's body heat) but avoid hot water bottles or electric heating pads directly on the skin. The priority is preventing further cooling, not rapid rewarming — rapid rewarming outside of hospital can trigger circulatory collapse.
5. Do not give anything to drink to a confused or unconscious person — there is a risk of choking and aspiration.
6. If the person is unconscious but breathing — place them in the recovery position (on their side) and monitor their breathing until emergency services arrive.
7. If the person is not breathing — begin CPR (chest compressions) and continue in line with the dispatcher's instructions. In severe hypothermia, people have survived prolonged cardiac arrest; keep going until help arrives.
8. Stay with the person and follow the dispatcher's instructions until the emergency team takes over.

When you must call emergency services

Do not delay calling for help if a cold-exposed person shows any of the following:

• any disturbances of consciousness — confusion, disorientation, unusual drowsiness, loss of consciousness,
• shivering that has stopped despite the person still being cold — this can indicate worsening hypothermia,
• slurred speech, extreme clumsiness or inability to stand,
• very slow pulse or breathing,
• signs of deep frostbite — black, hard, completely numb tissue,
• no improvement after moving indoors and basic rewarming,
• the affected person is a small child, an elderly person or someone chronically ill — here the threshold for concern is lower.

Who is most at risk?

Cold injuries can affect anyone caught unprepared, but certain groups deserve heightened attention.

• Small children and infants — their bodies have a much higher surface-area-to-volume ratio and lose heat far faster than adults. They cannot always communicate that they are cold.
• Elderly people — the ability to sense cold and to generate heat through shivering declines with age. Many older adults develop hypothermia indoors in a cool house, not just outdoors.
• Chronically ill people — especially those with diabetes (peripheral neuropathy reduces the ability to feel cold injury), cardiovascular disease, hypothyroidism or those taking certain medicines (beta-blockers, sedatives, alcohol) that impair the body's thermal response.
• People who are wet or fatigued — wet clothing loses virtually all insulating value; exhaustion depletes the glycogen reserves the body uses for shivering.
• Outdoor workers and winter sports enthusiasts — prolonged cold exposure, especially when combined with wind, is the classic setting for frostbite.
• People experiencing homelessness — lack of shelter makes them highly vulnerable during cold snaps.

Prevention — how to stay safe in the cold

The best cold injury is the one that never happens. A few practical rules cover most situations.

Dress in layers

• The three-layer principle: a moisture-wicking base layer, an insulating middle layer (fleece or down), and a wind- and waterproof outer shell.
• Prioritise extremities: gloves or mittens, wool socks, a hat covering the ears and a scarf or neck gaiter. Mittens are warmer than gloves for prolonged exposure.
• Avoid cotton next to the skin — it absorbs moisture and loses all insulating value when wet. Wool and synthetic base layers stay warm even damp.

Stay dry and manage sweat

• Adjust layers to avoid soaking your base layer in sweat. Being wet from perspiration is as dangerous as being wet from rain when the temperature drops.
• Change out of wet clothing as soon as you reach shelter.

Fuel and hydrate

• Shivering and heat production burn through energy fast. Eat regular, energy-rich snacks during prolonged cold exposure.
• Drink enough water. Cold air is dry and you can become dehydrated even in winter without noticing — dehydration impairs the body's ability to regulate temperature.
• Do not rely on alcohol to warm up. It creates a misleading feeling of warmth by dilating skin vessels, while actually accelerating heat loss from the core.

Plan outdoor activities carefully

• Tell someone where you are going and when you expect to return.
• Check weather forecasts, particularly wind-chill: wind dramatically increases heat loss from exposed skin. At −10 °C with strong wind the effective cold can feel like −25 °C or below.
• Know the early signs of frostnip and frostbite — act before the injury deepens.

What is worth keeping to hand in cold weather

For winter outdoor activities and a home winter medicine cabinet, consider having:

• Emergency foil (space) blanket — lightweight and invaluable for retaining body heat in an emergency.
• Chemical hand warmers — useful for rewarming frostnipped fingers on the go (apply over a layer of clothing, not directly on damaged skin).
• OTC pain relief — ibuprofen or paracetamol for pain management during and after frostbite rewarming. Follow the package instructions.
• Sterile dressings and bandages — for covering rewarmed blisters and protecting injured tissue.
• Thermometer — useful for checking body temperature if hypothermia is suspected.

Remember the most important limit: home measures and basic rewarming help with mild cold injuries. If hypothermia or deep frostbite is suspected, no item from the medicine cabinet replaces medical help — what counts is a call to emergency services.

Frequently asked questions

Is it safe to rewarm frostbitten feet by walking on them?

Walking on frostbitten feet before they are rewarmed can cause additional mechanical damage to frozen tissue, but it is sometimes necessary to reach safety. The key rule is: do not rewarm frostbitten tissue if there is any risk of refreezing. Tissue that thaws and then freezes again suffers far worse damage than tissue kept frozen until definitive medical care. If you have reached a safe, warm environment and there is no further risk of cold exposure, proceed with rewarming.

Should I rub frostbitten skin to restore circulation?

No. Rubbing frostbitten tissue causes direct mechanical injury to already-damaged cells and can worsen the outcome. The correct approach is gentle warmth — warm water immersion at 37–40 °C, body heat, or warm blankets. Never massage frostbitten areas.

A person with hypothermia has stopped shivering — is that a good sign?

No, it is often a bad sign. Shivering is the body actively fighting to generate heat. When it stops in a person who is still cold, it usually means the body no longer has the energy reserves to shiver — a sign that hypothermia is worsening, not improving. Call emergency services without delay.

Can hypothermia happen indoors?

Yes. Indoor hypothermia is a significant problem, particularly among elderly people living alone in poorly heated homes, and among people who are ill, malnourished or intoxicated. If you find an older relative who seems unusually drowsy, confused or very cold to the touch indoors in winter, take it seriously.

Are OTC pain relievers safe during frostbite rewarming?

Ibuprofen and paracetamol are commonly used for pain relief during frostbite rewarming and recovery; follow package guidelines and consult a pharmacist if you have any doubts. Do not use any pain reliever as a substitute for medical evaluation — deep frostbite and hypothermia require professional care regardless of pain levels.

What is "after-drop" and why does it matter?

"After-drop" refers to a further fall in core temperature that can occur after a hypothermic person is removed from the cold, as cold blood from the extremities circulates back towards the heart. This is why rough handling and standing a hypothermic person upright should be avoided — lie them flat, rewarm gently, and call for help. After-drop can trigger dangerous heart rhythms even after the person appears to be improving.

Summary — what is worth remembering?

✅ Frostbite and hypothermia are different conditions — frostbite is a localised tissue injury, hypothermia is a life-threatening fall in core body temperature.

✅ Consciousness is the key dividing line — a conscious, orientated person with cold patches on their skin points to frostbite. Confusion, drowsiness or loss of consciousness in a cold-exposed person means hypothermia.

✅ With hypothermia, call emergency services first — then move the person gently out of the cold and insulate them.

✅ Do not rub frostbitten tissue and do not use dry heat or very hot water — warm gently at 37–40 °C.

✅ Do not rewarm if there is a risk of refreezing — frozen then refrozen tissue suffers the worst damage.

✅ Shivering stopping is a warning sign, not a recovery sign — it often means hypothermia is deepening.

✅ Risk groups: children, elderly people, those with chronic illness, wet or fatigued people — heightened vigilance in winter for all of them.

Disclaimer

This article is purely educational in nature and does not replace the knowledge from a professional first aid course or a medical consultation. Hypothermia and deep frostbite are emergencies — if either is suspected, call emergency services immediately. If you have any doubts about the condition of the affected person, always call for help and follow the dispatcher's instructions. It is worth consulting a pharmacist about the choice of products available without a prescription.

Cold spells can be dangerous, but knowledge and preparation protect effectively. Understanding the difference between frostbite and hypothermia — and having a basic winter medicine cabinet at home with OTC pain relief, sterile dressings and emergency foil — gives real peace of mind for you and those close to you.

With CheaperForDrug you put your entire winter medicine cabinet into a single basket and compare its total cost across 100+ pharmacies at once. Real savings come from comparing the whole basket, not a single product — assemble your cold-weather kit sensibly and get through the winter safely without overpaying.