Stay indoors when possible. A number in degrees Fahrenheit that tells how hot it really feels with the heat and humidity. They usually involve the abdominal muscles or the legs. It is generally thought that the loss of water and salt from heavy sweating causes the cramps. It typically occurs when people exercise heavily or work in a warm, humid place where body fluids are lost through heavy sweating.
Fluid loss causes blood flow to decrease in the vital organs, resulting in a form of shock.
With heat exhaustion, sweat does not evaporate as it should, possibly because of high humidity or too many layers of clothing. As a result, the body is not cooled properly. Body temperature will be near normal. Also known as sunstroke, heat stroke is life threatening. The victim's temperature control system, which produces sweating to cool the body, stops working.