What heat injury causes a total breakdown of the body's heat balance from overexposure to heat stress?

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Heat stroke is a life-threatening heat injury where the body's temperature-regulation system stops working properly due to overexposure to heat. When the system is overwhelmed, core temperature climbs rapidly and sweating may cease, so the body can no longer balance heat. This leads to mental status changes such as confusion or unconsciousness, and the person can deteriorate quickly if not treated.

This is the best answer because it specifically describes a complete breakdown of the body's heat balance, unlike heat exhaustion (where the body is overheating but still sweating), heat rash (skin irritation), or heat cramps (muscle cramps from electrolyte loss). Immediate cooling and medical care are essential: move the person to a cooler place, remove excess clothing, apply cool compresses or immerse in cool water, and seek emergency medical help.