Temperature illness often begins as a performance problem: pace changes, judgment slips, coordination declines, or behavior becomes unusual. Prevention depends on clothing, hydration, food, shade, workload, acclimatization, weather timing, and team observation. Early action is easier than treatment after a person can no longer help themselves.
Prevent cold stress through moisture control
Protect insulation from rain, sweat, immersion, and ground heat loss. Adjust layers before heavy sweating, carry dry clothing in waterproof storage, eat regularly, and shelter from wind. Watch for persistent shivering, fumbling, slurred speech, confusion, apathy, and declining coordination. Cold can impair insight, so teammates must notice changes.
Act early when someone is getting cold
Stop exposure, add shelter and dry insulation, replace wet clothing, insulate from the ground, and provide warm fluids and food only if the person is alert and able to swallow. Handle a severely cold person gently and seek emergency help. Do not rely on alcohol, vigorous rubbing, or direct high heat. Follow current medical guidance and your training.
Prevent heat illness by managing workload
Acclimatize gradually, start during cooler hours, use shade and ventilation, adjust pace, drink appropriately, eat, and replace electrolytes based on conditions and individual needs. Sun protection and light clothing help. Watch for headache, nausea, cramps, dizziness, unusual fatigue, confusion, collapse, and hot skin. Symptoms can progress quickly.
Treat severe heat signs as an emergency
Confusion, altered behavior, seizures, fainting, or severe deterioration in heat require urgent cooling and emergency response. Move the person from heat, remove excess clothing, and use rapid cooling methods consistent with current first-aid protocols while activating help. Do not delay cooling while waiting for transport. Medical conditions and medications may change risk.
Early warning comparison
| Cold stress | Heat stress |
|---|---|
| Shivering or loss of shivering | Heavy sweating or unexpectedly dry hot skin |
| Fumbling and poor coordination | Dizziness, weakness, headache |
| Slowed speech and thinking | Nausea, cramps, irritability |
| Apathy or confusion | Confusion, collapse, seizure |
| Wet clothing and wind exposure | Heat, exertion, poor acclimatization |
Common mistakes to avoid
- Waiting for dramatic symptoms: Early performance changes are the warning.
- Treating hydration as the only heat control: Pace, shade, acclimatization, clothing, and cooling also matter.
- Making the affected person self-assess alone: Temperature illness can impair judgment.
Field checklist
- Plan clothing and pace for the forecast
- Protect dry insulation and shade options
- Eat and drink on a schedule appropriate to effort
- Use buddy observation
- Know emergency triggers and local response options
Frequently asked questions
Can hypothermia happen above freezing?
Yes. Wind, rain, immersion, exhaustion, and inadequate clothing can cause dangerous heat loss in cool conditions.
Is sweating required for heat stroke?
No. Sweating may be present. Altered mental status in a hot person is a critical warning.
How much should I drink?
Needs vary. Avoid both dehydration and forced overdrinking; match intake to conditions, exertion, food, and individual guidance.
Final word
Temperature illness is easiest to manage while the person is still merely uncomfortable. Treat small changes as actionable information, not a character test.
Editorial note: This is not a substitute for wilderness first-aid training or medical care. Follow current emergency medical guidance and activate local emergency services for severe symptoms.