Heat stroke

Heat stroke or heatstroke, also known as sun-stroke, is a severe heat illness that results in a body temperature greater than 40. 0 °C (104. 0 °F), along with red skin, headache, dizziness, and confusion.

Sweating is generally present in exertional heatstroke, but not in classic heatstroke.
The start of heat stroke can be sudden or gradual.
Heatstroke is a life-threatening condition due to the potential for multi-organ dysfunction, with typical complications including seizures, rhabdomyolysis, or kidney failure.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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