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It's Not Just the Patient at Risk
We tend to picture casualties in the mountains as cold, wet and shivering.
But more and more of us are travelling to hot places. Morocco. Southern Europe. Nepal in spring. The Alps in summer. Desert rallies. Overland trips. Adventure races.
And increasingly, the UK itself.
When someone becomes injured or ill in the heat, the environment becomes part of the emergency.
Because the casualty isn't the only person under pressure.
You are too.
Heat Is More Dangerous Than Most People Realise
Heat-related illness exists on a spectrum.
It starts with discomfort and dehydration, progresses through heat exhaustion and can end in heat stroke — a medical emergency with potentially life-threatening consequences. The severity of illness depends not just on how hot someone becomes, but how long they remain overheated. Early recognition and rapid cooling are critical.
In other words:
Time matters.
And in remote or austere environments, time is exactly what you don't have.
The Casualty Is Only Half the Problem
Imagine the scene.
You're in Spain on a mountain bike trip.
A rider crashes.
It's 34°C.
You've stopped moving, so there is no breeze. The casualty is lying on hot rock. Everyone crowds round. Packs come off. Water bottles appear.
Ten minutes later:
The casualty is injured.
The group is anxious.
Someone hasn't drunk enough.
Another person is starting to feel faint.
Everyone is standing in direct sun.
The incident is growing.
I've seen this in different forms, army, mountain rescue. The original emergency is manageable.
Now its getting more complicated.
Heat increases fatigue, impairs concentration and increases the risk of accidents and mistakes. Outdoor workers, first responders and anyone carrying out physical activity are particularly vulnerable.
Your First Actions: Buy Time
My teaching often comes back to one principle:
Every action buys time until definitive care.
In hot environments, your priorities become:
Make the scene safe.
Move the casualty out of direct sun if possible.
Protect yourself and your group.
Start active cooling early.
Manage fluids sensibly.
Plan how you're getting help.
Simple.
Not always easy.
Shade Is Treatment
A surprising amount of casualty care in hot environments is environmental management.
Can you:
Move to shade?
Create shade with tarps or survival bags?
Get air moving?
Remove excess clothing or equipment?
Cool the skin with water?
Rotate rescuers?
These aren't comfort measures.
They're treatment.
The Wilderness Medical Society emphasises that rapid cooling and reducing heat exposure are key interventions in serious heat illness, particularly heat stroke. Outcomes worsen the longer the casualty remains hyperthermic.
Hydration Isn't Just "Drink More Water"
This catches people out.
When it's hot, people often obsess over drinking.
But dehydration isn't simply a lack of water.
Sweating causes losses of both fluid and electrolytes. Heat exhaustion is commonly associated with this combined loss, causing symptoms such as dizziness, weakness, headache, nausea and poor decision-making.
The answer isn't always:
"Drink as much as possible."
It is:
Drink regularly.
Replace electrolytes on prolonged activities.
Eat normally if able.
Monitor urine colour and frequency.
Avoid waiting until you're thirsty.
And remember:
A casualty who is confused, vomiting or unconscious may not be able to drink safely at all.
Heat Stroke Is Different
Heat stroke is not simply "bad heat exhaustion".
It is a medical emergency.
The classic features are:
Altered behaviour or confusion.
Collapse.
Unsteadiness.
Agitation.
Reduced consciousness.
Very high body temperature.
Importantly, the casualty may still be sweating.
You cannot rely on dry skin as a sign.
The Wilderness Medical Society guidelines describe heat stroke as a spectrum of neurological dysfunction occurring alongside dangerous hyperthermia and emphasise that rapid cooling is the priority treatment.
If you suspect heat stroke:
Cool first. Transport second.
Think About the Rescuers
This is something military and rescue teams understand well.
You monitor the team as much as the casualty.
Who's drinking?
Who's getting irritable?
Who's standing in the sun because they're focused on helping?
Who's carrying all the equipment?
Because a single casualty can quickly become two.
Or three.
The World Health Organization warns that heat exposure increases accidents, reduces physical and cognitive performance and places anyone working outdoors at increased risk.
Preparation Starts Before the Incident
The best casualty care in hot environments starts long before someone gets hurt.
Think about:
Weather forecasts.
Water availability.
Electrolyte replacement.
Shade and shelter.
Route timing.
Communication plans.
Local emergency services.
Medical facilities.
Personal fitness and acclimatisation.
Heat illness is largely preventable.
Preparation matters.
Final Thoughts
I love hot places.
I've worked in them, travelled in them and trained in them.
But heat has a way of turning small problems into bigger ones.
The casualty isn't just fighting injury or illness.
They're fighting the environment.
And so are you.
Train for it.
Carry the right kit.
Look after your team.
And remember:
When help isn't immediate, your training matters.
Be Adventure Ready.
References
Wilderness Medical Society Clinical Practice Guidelines for Prevention and Treatment of Heat Illness (2024).
World Health Organization. Heat and Health (2026).
Wilderness Medical Society. Heat Illness Clinical Practice Guideline Summary.
World Health Organization. Public Health Advice on Heatwaves.
Savioli G et al. Heat-Related Illness in Emergency and Critical Care (2022).
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