Heat Exhaustion vs Heatstroke
Also known as: Heat illness, Hyperthermia, Sunstroke, Heat-related illness
Heat exhaustion is overheating with heavy sweating; heatstroke is a life-threatening emergency where sweating stops.
Last updated: 2 April 2026
Real-world example
You're sightseeing in Marrakech in July (42°C). After 3 hours walking, you feel dizzy, nauseous, and are sweating heavily. This is heat exhaustion. You move to shade, drink water, and cool down with wet cloths. If you'd ignored these symptoms and kept walking, your body temperature could have risen above 40°C, sweating could have stopped, and you'd have progressed to heatstroke, which requires emergency hospital treatment.
Why travellers need to know
Travellers are particularly vulnerable to heat illness because they're often more active than locals (sightseeing, hiking), less acclimatised to the heat, and may not recognise early warning signs. The critical distinction is: heat exhaustion is your body's warning system working; heatstroke is that system failing. Knowing when to stop, cool down, and hydrate prevents the escalation that turns a bad afternoon into a medical emergency.
Country-specific notes
Summer temperatures exceed 45°C; outdoor activity dangerous
UAE summer (June-September) regularly exceeds 45°C with high humidity. Outdoor activity during midday hours is genuinely dangerous for unacclimatised visitors. Hotels, malls, and taxis are heavily air-conditioned, creating large temperature differentials that stress the body.
Frequently asked questions
How Nomedic helps
Your Nomedic record includes medications that affect heat tolerance (diuretics, beta-blockers, antihistamines), giving treating doctors critical context in a heat emergency.
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Medications that affect heat risk — on your record.
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