The fastest safe way to warm up after being in the cold is to get indoors, swap any wet clothing for dry layers, and let your body generate its own heat under blankets or warm clothing. For most people, this passive approach combined with a warm drink and light movement is enough. But how you rewarm matters, especially if your skin is numb or you’ve been exposed for a long time, because warming too aggressively or in the wrong way can cause real harm.
What Your Body Is Already Doing
Before you take any action, your body has already launched a defense. When you get cold, blood vessels near your skin tighten to keep warm blood closer to your vital organs. That’s why your fingers, toes, and nose go pale or feel numb first. Your body is sacrificing warmth at the surface to protect your core temperature. Skin cools, but your heart, brain, and lungs stay warm longer.
If that isn’t enough, shivering kicks in. Shivering is involuntary, rhythmic muscle contractions that generate heat. About 70% of the energy your muscles burn during contractions is released as heat rather than movement, which makes shivering surprisingly effective at raising your temperature. If you’re still shivering, that’s actually a good sign. It means your body’s warming system is working.
Step by Step: Warming Up Safely
Once you’re indoors or in shelter, work through these steps in order:
- Remove wet clothing immediately. Wet fabric pulls heat from your body far faster than dry air does. Swap everything, including socks, gloves, and base layers, for dry clothes.
- Layer up and insulate. Wrap yourself in blankets, sleeping bags, or dry coats. The goal is to trap the heat your body is already producing. Even a simple space blanket (the reflective foil kind) works well because it reflects your own body heat back toward you.
- Drink something warm. A warm, non-alcoholic drink like tea, broth, or hot chocolate helps raise your core temperature from the inside. It also feels good, which is reason enough.
- Move gently. Light activity like walking around a room or doing gentle arm circles gives your muscles something to do besides shiver. Voluntary movement generates heat through the same mechanism as shivering, just more comfortably.
- Warm your core first. If you’re using a heating pad, hot water bottle, or warm compress, place it against your chest, neck, or armpits rather than your hands and feet. Warming your trunk helps heated blood circulate to the rest of your body naturally.
For most cold exposures, like walking home in freezing weather or spending too long at an outdoor event, these steps are all you need. You should feel noticeably better within 20 to 30 minutes.
Why You Shouldn’t Warm Up Too Fast
It’s tempting to jump into a hot shower or hold your frozen hands over a heater. But aggressive rewarming carries risks, especially after prolonged cold exposure. One concern is a phenomenon called “afterdrop,” where your core temperature actually continues to drop for a period even after you’ve started warming up. This happens because heat moves through tissue in layers. Your outer tissues warm first, but the cold stored deeper in your muscles and fat continues to pull heat away from your core temporarily. In someone who is significantly cold, this continued drop can stress the heart.
The practical takeaway: warm up gradually. A warm room, dry layers, and a hot drink are safer than blasting yourself with extreme heat. If you do take a bath or shower, use warm water rather than hot. Water around 37 to 40°C (about 98 to 104°F) is the range that warms effectively without risking tissue damage or a dangerous temperature swing.
If Your Skin Is Numb or Discolored
Cold, red, tingly skin that hurts a bit is frostnip, the mildest stage of cold injury. It’s temporary and you can treat it yourself by warming the area gently. Soak affected fingers or toes in warm (not hot) water for about 30 minutes, or press a warm, wet cloth against your nose or ears.
If your skin has turned white, grayish, or feels waxy and hard, that’s beyond frostnip. Superficial frostbite means the water in your skin cells is starting to freeze into ice crystals. You may feel a “pins and needles” sensation, or the area may feel warm even though it’s freezing, which is deceptive. Deep frostbite causes complete numbness. Both stages need medical attention.
While waiting for help or getting to a hospital, remove any wet clothing, rings, or watches near the affected area and put on dry layers. Do not rub or massage the frozen skin. Ice crystals that have formed in the tissue can tear cells apart if you manipulate them, turning a recoverable injury into permanent damage. And if there’s any chance the area could refreeze before you reach care, it’s better to leave it frozen. A freeze-thaw-refreeze cycle causes far worse tissue destruction than staying frozen a bit longer.
Mistakes That Slow You Down
Alcohol is the most common mistake people make when trying to warm up. A drink feels warming because alcohol lowers the threshold at which your blood vessels constrict, meaning vessels in your skin open up sooner and let warm blood flow to the surface. That creates a sensation of warmth, but you’re actually losing core heat faster through your skin. Alcohol also impairs judgment, making you less likely to recognize when you’re in danger.
Other mistakes to avoid:
- Using very hot water. If your skin is numb, you can’t gauge temperature accurately and may burn yourself without realizing it. Stick to warm water you can comfortably hold your hand in.
- Placing frozen skin directly against a heater or fire. Numb tissue can burn before you feel any pain. Keep a safe distance from direct heat sources.
- Staying in wet clothes “just for a minute.” Even indoors, wet fabric continues to drain your body heat. Change immediately.
When Cold Exposure Becomes Hypothermia
Normal body temperature is around 37°C (98.6°F). Hypothermia begins when your core drops below 35°C (95°F). At this point, you may not realize how cold you are because the early symptoms, fatigue, confusion, clumsiness, and impaired judgment, make it hard to assess your own condition.
Mild hypothermia (core temperature 32 to 35°C, or 90 to 95°F) causes shivering, nausea, fatigue, and difficulty thinking clearly. Your heart rate and blood pressure rise as your body fights to produce heat. At this stage, getting warm indoors with the steps above is often effective.
Moderate hypothermia (28 to 32°C, or 82 to 90°F) is more serious. Shivering typically stops once core temperature drops to around 30 to 32°C, which is a dangerous sign because it means your body has lost its primary heat-generating tool. Lethargy sets in, reflexes slow, and heart rhythm can become irregular. This requires emergency medical care, not home treatment.
Severe hypothermia (below 28°C, or 82°F) causes unresponsiveness, extremely low blood pressure, and risk of cardiac arrest. Someone in this state may appear dead but can sometimes be resuscitated with proper medical rewarming. The old saying in emergency medicine is “nobody is dead until they’re warm and dead.”
If you or someone with you is confused, has stopped shivering despite still being cold, or is becoming drowsy and uncoordinated, that’s beyond the help of blankets and hot tea. Call emergency services and focus on preventing further heat loss while waiting.