First Aid for Heat Exhaustion and Heatstroke
November 28 2025
3 min reading time
Hot weather, intense activity and poor ventilation can all lead to heat-related illnesses. Heat exhaustion is more common and often develops gradually, while heatstroke is more severe. Knowing simple first aid steps can help support someone while you decide whether further help is needed.
This guide explains the signs of heat exhaustion and heatstroke, first aid steps, prevention tips and how to prepare your first aid kit for warm weather conditions.
For outdoor preparation, see our hiking first aid guide .
Heat Exhaustion vs Heatstroke
Condition
What It Means
Common Signs
Heat Exhaustion The body is becoming too warm and struggling to cool down.
Tiredness, headache, dizziness, sweating, feeling faint.
Heatstroke A more severe form where the body becomes extremely hot.
Changes in behaviour, confusion, hot skin.
Signs of Heat Exhaustion
Feeling faint or lightheaded
Headache
Sweating
Cool, pale skin
Cramps
Nausea
Feeling unusually tired
First Aid for Heat Exhaustion
Move to a cooler place — shade or indoors with ventilation.
Encourage drinking water (small, regular sips).
Loosen clothing to improve airflow.
Use something cool on the skin (cold pack wrapped in cloth).
Encourage resting until feeling better.
For general home safety, see our home first aid kit guide .
Signs of Heatstroke
Heatstroke is more serious, and someone may show:
Hot skin
Acting unusually or confused
Difficulty responding normally
Lack of sweating despite heat
First Aid for Heatstroke
If someone appears to have heatstroke:
Move them to a cooler place immediately.
Cool the skin with something cold (cold packs, cool water).
Encourage small sips of water if the person is responsive.
Provide reassurance and support while monitoring their comfort.
Useful First Aid Kit Items for Hot Weather
Cold packs
Foil blanket (helps with temperature control outdoors)
Water bottle
Hydration salts (optional)
Gloves
Wipes for cooling
You can browse our full range of first aid kits or restock using our refills guide .
Who Is at Higher Risk During Hot Weather?
Young children
Older adults
People working outdoors
Hikers, runners and cyclists
Travellers in hot climates
People in enclosed vehicles
For travel safety, see our travel first aid guide .
Preventing Heat Exhaustion & Heatstroke
Stay hydrated during warm weather
Take breaks during physical activity
Wear breathable clothing
Keep indoor spaces ventilated
Avoid prolonged time in enclosed vehicles
Check on vulnerable people during heatwaves
Heat Exhaustion & Heatstroke — FAQ
Should I use ice directly on the skin?
Use cold packs wrapped in cloth rather than applying ice directly to the skin.
Can I give someone sports drinks?
Water is ideal. Small sips are recommended.
Do heat-related issues only happen in summer?
Heat illnesses can occur indoors or in vehicles at any time of year.
Is sweating a sign of heatstroke?
Heatstroke may involve little or no sweating.
Who is most at risk?
Children, older adults, outdoor workers and people exercising in warm conditions.
