Heat stroke is a medical emergency that happens when the body overheats and can't cool itself. Learn the warning signs and what to do to cool someone while waiting for help.
Heat can leave anyone feeling tired, but the sudden, profound exhaustion of heat stroke is different. It often comes paired with the other signs covered here: confusion, a racing heart, or a very high temperature. On its own, fatigue might just mean someone overdid it and needs rest in a cool place. Combined with those other symptoms, it points to heat stroke and an emergency. When in doubt, treat it as the serious end: get the person cool, call for help, and keep cooling them until it arrives.

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