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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.
1 Someone who is suffering from sunstroke feels dizzy and has a high temperature, but does not sweat. 2  Don't look down! You'll get dizzy. 3  I keep having/getting dizzy spells.  It seemed to happen all of a sudden - I felt dizzy and I just collapsed.