Signs of hypothermia and how to warm someone
Hypothermia starts with shivering, clumsy hands, slurred words and stumbling, and turns dangerous when shivering stops and the person grows drowsy or confused. Call 911, get them out of wind and wet, take off wet clothes, insulate them from the ground, and wrap them in dry layers. Give warm sweet drinks only if they are alert and can swallow.
About 15 minutes to learnSafety critical: tightly scoped, know when to call a professional
Mark it once you can do it without this page open.
How to do it
- Watch for early signs in others and yourself: shivering, fumbling hands, stumbling, mumbling and grumpiness.
- Get the person out of the wind, rain or cold water, into a tent, car or building if possible.
- Call 911 if they are confused, very drowsy, or have stopped shivering while still cold.
- Remove wet clothing gently and replace it with dry layers, a hat and gloves.
- Put insulation under them, such as a sleeping pad or pack, since the ground pulls heat away.
- Wrap them in blankets or a sleeping bag, and put warm packs or bottles wrapped in cloth on the chest, neck, armpits and groin.
- Give warm, sweet, non-alcoholic drinks only if they are fully alert and can swallow.
- Handle a severely cold person gently and keep them lying flat until help arrives.
Stop and call a professional if
- Call 911 for confusion, slurred speech, drowsiness, loss of shivering while cold, or a weak or slow pulse.
- If they are unresponsive and not breathing normally, start CPR and continue until help arrives.
- Any hard, pale or numb patches of skin may be frostbite: do not rub them; get medical care.
Common mistakes
- Rubbing their arms and legs hard.
- Giving alcohol to warm them up.
- Putting a severely cold person in a hot bath.
- Leaving them in wet clothes because they insist they are fine.
Quick self-check
Three questions. Your last score is kept in this browser.
Teach this to someone
A one-page sheet for showing a friend, a roommate or a kid: what to say, what to show, and one question to check it landed.
Teach: Signs of hypothermia and how to warm someone
What to say
Hypothermia starts with shivering, clumsy hands, slurred words and stumbling, and turns dangerous when shivering stops and the person grows drowsy or confused. Call 911, get them out of wind and wet, take off wet clothes, insulate them from the ground, and wrap them in dry layers. Give warm sweet drinks only if they are alert and can swallow.
What to show, in order
- Watch for early signs in others and yourself: shivering, fumbling hands, stumbling, mumbling and grumpiness.
- Get the person out of the wind, rain or cold water, into a tent, car or building if possible.
- Call 911 if they are confused, very drowsy, or have stopped shivering while still cold.
- Remove wet clothing gently and replace it with dry layers, a hat and gloves.
- Put insulation under them, such as a sleeping pad or pack, since the ground pulls heat away.
- Wrap them in blankets or a sleeping bag, and put warm packs or bottles wrapped in cloth on the chest, neck, armpits and groin.
- Give warm, sweet, non-alcoholic drinks only if they are fully alert and can swallow.
- Handle a severely cold person gently and keep them lying flat until help arrives.
When to stop and call a professional
- Call 911 for confusion, slurred speech, drowsiness, loss of shivering while cold, or a weak or slow pulse.
- If they are unresponsive and not breathing normally, start CPR and continue until help arrives.
- Any hard, pale or numb patches of skin may be frostbite: do not rub them; get medical care.
The check question
Ask: A cold hiker stops shivering and becomes drowsy. What does that mean?
Related skills
- What to do if you get lost hiking
- How to shovel snow without hurting yourself
- Heat exhaustion vs heat stroke
- Every skill in Outdoors
Words on this page
Sources
- National park and forest service visitor safety guidance, current edition. Checked September 28, 2026.
- National resuscitation and first aid guidelines, 2025 guidelines. Checked September 28, 2026.
Last reviewed . First published .