What is heat stroke caused by?

Heat Stroke: Heat stroke results from prolonged exposure to high temperatures -- usually in combination with dehydration -- which leads to failure of the body's temperature control system. The medical definition of heat stroke is a core body temperature greater than 105 degrees fahrenheit, with complications involving the central nervous system that occur after exposure to high temperatures. Call 911 if susp.

Heat Stroke!: Heat stroke is the most serious form of heat injury and is considered a medical emergency. If you suspect that someone has heat stroke -- also known as sunstroke -- call an ambulance immediately and give first aid until paramedics arrive. http://www.webmd.com/a-to-z-guides/heat-stroke-symptoms-and-treatment#1