what is the most serious type of heat injury that can lead to death?
There three types of heat-related injuries: 1  Heat cramps. These are painful muscle cramps, usually in the stomach, arms, or legs, that may occur during heavy activity. 2  Heat exhaustion. This is the body's response to losing too much water and salt in sweat. 3  Heat stroke. This is the most serious type of heat-related injury. Heat stroke, also known as sun stroke, occurs when the body becomes unable to cool itself down. The body's temperature may rise to 106 degrees Farenheit or higher within minutes. If heat stroke is not treated quickly, it can lead to brain damage or death.