A heatwave isn't just uncomfortable; it's a physiological assault. The body struggles to maintain its core temperature, the heart works harder, and dehydration can set in within hours. Emergency services see an increase in heat-related illnesses every summer, many of which are preventable.
The primary threat remains dehydration, which can cause headaches, dizziness, confusion, or cramps. In older adults, it can develop into heatstroke, a life-threatening emergency where the body temperature exceeds 40°C (104°F). Infants, however, dehydrate very quickly because their thermoregulation system is immature.
Cardiologists also remind us that heat increases heart rate and can destabilize people with heart failure or those taking certain diuretics.
Actions that truly protect To limit these risks, the recommendations are clear: drink regularly, even if you're not thirsty, and cool down your body several times a day. A lukewarm shower, a damp cloth, or a spray bottle is enough to lower body temperature.
At home, closing shutters and windows during the day remains one of the most effective ways to maintain a comfortable environment. Doctors also recommend limiting physical exertion, which increases internal heat production.
Mistakes that Worsen Health
Alcohol, sugary drinks, or highly caffeinated beverages accelerate dehydration. Avoid physical exertion and all sports. Opening windows during the day lets in hot air. And above all, never leave a child, a vulnerable person, or an animal in a car, even for a few minutes. Finally, remember to store your medications in the coolest possible place.
In Case of Symptoms
Headache, nausea, unusual fatigue, and hot, dry skin should raise concern. If in doubt, call 15 immediately and cool the person down while waiting for emergency services.
 Frank Verain
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23/06/2026 | 
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