Protecting the Vulnerable in Extreme Heat: Who Is at Risk, and What Actually Helps
Heatwaves do not kill evenly — the dead are overwhelmingly the old, the very young, the chronically ill, and the alone. Knowing who is at risk near you, and doing one small thing, is the highest-leverage act of a heatwave.
Heat is not a fair killer
The 2003 European heatwave killed an estimated 14,000 people in France alone — and the pattern repeats every major event: the victims are mostly elderly, often living alone, dying indoors at night, with no one checking in. Heat is one of the few disasters where a single neighbour's knock measurably saves lives.
Who is genuinely at higher risk
- People over 65, especially living alone — the ability to sense heat and to sweat declines with age; many don't feel thirsty or hot until they are already in trouble.
- Infants and young children — they heat up far faster than adults and can't tell you or act. Never leave a child in a parked car, even for minutes — the interior reaches lethal temperatures in well under a quarter of an hour.
- Pregnant women.
- Chronic conditions — heart, kidney, diabetes, respiratory, and neurological conditions all reduce heat tolerance.
- People on certain medications — diuretics, some blood-pressure drugs (ACE inhibitors, ARBs, beta-blockers), antidepressants and antipsychotics, antihistamines, and lithium can impair temperature or fluid control. Do not stop any medication because of heat — ask a pharmacist or doctor whether timing or water intake should change.
- People with limited mobility or cognitive impairment, and outdoor workers.
What actually helps
- Adopt one person. Pick the most at-risk person you know and check on them once a day during a heat event — in person if you can, a phone call if not.
- Check three things: Is their home too hot, especially at night? Are they actually drinking (not just "fine")? Are they confused, unusually tired, or have they stopped sweating? The last is an emergency.
- Cool them, simply: move them to the coolest room, get fluids in, wet skin and a fan, a cool shower. For the warning signs of heat exhaustion tipping into heatstroke — and what is forbidden — see Hypothermia and Heatstroke.
- For infants: lighter clothing, frequent small feeds/fluids, the coolest room, constant supervision. Watch for fewer wet nappies, lethargy, or a sunken soft spot — get medical help early.
The quiet part
Most heat deaths are preventable, and prevented socially — not with gear, but with attention. A community that knows who its vulnerable members are loses far fewer of them. That is the whole point. (Keeping their home survivable: Cooling a Home Without Air Conditioning.)
Sources: WHO Public Health Advice on Heat; Santé Publique France 2003 retrospective; NHS / UKHSA Heat-Health guidance; Red Cross/IFRC. Educational reference — not medical advice; for any acute symptoms, contact your local emergency number.