People most at risk for heat-related illness include the very young, the elderly, and those who overexert themselves in hot environments either at work or during recreational activities.
However, given sufficient heat exposure, anyone can develop fatal heatstroke.
Heatstroke, the most serious heat-related illness, is a medical emergency characterized by a body temperature greater than 105 degrees, and may include symptoms such as dry, red skin, disorientation, irritability, convulsions, shivering, delirium and coma.
A person can go from normal to seriously ill in minutes.
Treatment involves the rapid lowering of body temperature, using a cool bath or wet towels. Keep the victim in a cool area.
Heat exhaustion is a milder form of heat-related illness that may develop due to a combination of high temperatures for several days and a person's inadequate replacement of fluids and electrolytes.