Debility caused by exposure to heat and humidity, usually for many hours, called sunstroke when caused by direct sunlight. Body temperature is 106–110°F (41–43°C) or higher. Perspiration almost stops, leading to the rapid temperature rise, collapse, and coma. Cooling with ice-water baths or packs, with massage to promote circulation, is urgent to save the victim's life. Even after body temperature drops, circulatory disorder and brain damage may cause death. See also heat exhaustion.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on heatstroke, visit Britannica.com.

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