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.
A pounding or throbbing headache is a common sign that the body is overheating. It often shows up as heat builds and can persist for hours. If a headache sets in during heat or exertion, treat it as an early warning: move to a cooler location, rest, and apply a cool, damp cloth to the head and neck. If the person is fully alert, sips of cool water help too. A headache that comes with confusion, a very high temperature, or any of the other signs here points to heat stroke and needs emergency care.

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