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Sunstroke is a life threatening condition caused by overexposure to extreme heat. Also sometimes called heatstroke, this condition occurs when the bodyâs heat control system fails and it cannot lose the excessive heat. High temperatures can cause the bodyâs major organs to fail.unstroke is a life threatening condition caused by overexposure to extreme heat. Also sometimes called heatstroke, this condition occurs when the bodyâs heat control system fails and it cannot lose the excessive heat. High temperatures can cause the bodyâs major organs to fail.
Heatstroke is a condition caused by your body overheating, usually as a result of prolonged exposure to or physical exertion in high temperatures. This most serious form of heat injury, heatstroke, can occur if your body temperature rises to 104 F (40 C) or higher. The condition is most common in the summer months.