Protect yourself and others from life-threatening heatwaves — recognise heat illness, stay cool without power, and care for vulnerable people.
Heat is the deadliest weather-related killer in many parts of the world — more deadly than floods, storms, and hurricanes combined in some regions. During the 2003 European heatwave, over 70,000 people died in just two weeks. In 2022, heat-related deaths across Europe exceeded 60,000 in a single summer. Heat kills silently and without drama, which is precisely why it is so dangerous — people often do not recognise how serious their condition has become until they are already in crisis.
Understanding heat illness, staying hydrated, and protecting vulnerable people are the core survival skills for extreme heat events.
Heat illness exists on a spectrum from mild to life-threatening:
| Condition | Symptoms | Severity | Action |
|---|---|---|---|
| Heat cramps | Muscle cramping in legs/abdomen | Mild | Rest, hydrate, move to cool area |
| Heat exhaustion | Heavy sweating, weakness, cold/pale/clammy skin, nausea, headache, fast/weak pulse | Moderate | Move to cool location, hydrate, wet skin, seek medical care if no improvement in 1 hour |
| Heat stroke | High body temperature (40°C / 104°F+), hot/red/dry OR damp skin, rapid strong pulse, confusion, possible unconsciousness | Life-threatening | CALL EMERGENCY SERVICES IMMEDIATELY — cool the person by any means possible |
⚠️ Heat stroke is a medical emergency. The body has lost the ability to regulate its own temperature. Without immediate cooling, brain damage and organ failure occur within minutes. Call emergency services and begin cooling instantly — do not wait.
| Rule | Detail |
|---|---|
| Drink before you are thirsty | Thirst means you are already mildly dehydrated |
| Quantity | At least 2–3 litres (68–100 oz) of water per day in extreme heat, more if active |
| Avoid alcohol | Alcohol increases urine output and dehydrates rapidly |
| Avoid excessive caffeine | Mild diuretic effect — limit coffee and energy drinks |
| Watch urine colour | Pale yellow = well hydrated. Dark yellow = drink more. Dark brown = serious dehydration, seek medical care |
| Electrolytes matter | If sweating heavily for hours, use oral rehydration salts or sports drinks — plain water can cause hyponatraemia (dangerously low sodium) |
| Group | Risk Factor | Action |
|---|---|---|
| Elderly (65+) | Reduced thirst sensation, poorer heat regulation, often alone | Check on elderly neighbours twice daily during heatwave |
| Infants and young children | High surface area to body weight ratio, cannot self-regulate | Keep out of direct sun, ensure constant hydration |
| Outdoor workers | Extended exertion in heat | Mandatory rest breaks in shade, hydration schedule |
| People with chronic illness | Heart disease, diabetes, kidney disease increase risk | Review medications with doctor, ensure cooling access |
| People taking certain medications | Diuretics, antipsychotics, antihistamines impair heat response | Extra vigilance, seek medical advice |
| Athletes and those exercising | Voluntary exertion accelerates heat load | Train only in early morning or late evening; monitor for symptoms |
⚠️ Check on elderly neighbours and family members every day during a heatwave. Social isolation is a major risk factor in heat deaths — most heat fatalities are people who were alone and had no one to notice their deterioration.
If someone has a high body temperature (40°C / 104°F or above), confusion, or has lost consciousness:
If air conditioning fails during extreme heat:
| Situation | Action |
|---|---|
| Heatwave forecast | Fill water containers, locate coolest room, check cooling centres |
| Heavy sweating, weakness, headache | Move to cool area, drink water, apply cool wet towels |
| Confusion, high body temp, not sweating | Heat stroke — call emergency services, cool immediately |
| No power, home overheating | Go to public cooling centre, wet towels on body, open at night |
| Elderly neighbour not seen today | Check on them — heat deaths often involve isolated people |
| Dark yellow or brown urine | Drink water immediately — seek care if brown |
This guide is for general preparedness education. In a medical emergency, call local emergency services immediately. The information here is not a substitute for professional medical advice.
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