Heat stroke, also known as sun stroke, is a type of severe heat illness that results in a body temperature greater than 40.0 °C (104.0 °F) and confusion. Other symptoms include red skin, headache, and dizziness. There is generally a lack of sweating in classic heat stroke while sweating is generally present in exertional heatstroke.
Heat exhaustion is a severe form of heat illness.It is a medical emergency.Heat exhaustion is caused by the loss of water and electrolytes through sweating.. The United States Department of Labor makes the following recommendation, "Heat illness can be prevented.