Fitness
Exertional Heat Illness
Exertional heat illness covers cramps through heat stroke during hot exercise—stop, cool, and hydrate when fatigue, nausea, or confusion appear.
Exertional heat illness is a spectrum of heat-related conditions triggered by exercise in hot environments—from muscle cramps through heat exhaustion to life-threatening heat stroke. Risk rises with high wet-bulb temperature, poor acclimation, dehydration, and back-to-back hot days.
Early signs include heavy fatigue, headache, nausea, and confusion; stop and cool immediately when cognition slips.
Common questions
-
What is the first sign of exertional heat illness?
Performance collapse, unusual fatigue, headache, or nausea often precede serious progression. Treat any confusion, stumbling, or hot skin with stopped sweating as an emergency.
Related terms
Put Exertional Heat Illness into practice
Ohga connects nutrition, fitness, focus, and habits with an AI copilot that learns your patterns. Join the waitlist for early access.