Exhaustion is caused by excessive fluid loss. Increased sweating, high body temperature, cool wet skin and some lack of coordination are signs of heat exhaustion. Heat stroke is extremely serious and can be fatal. Requires immediate medical attention. Signs include numbness and pale grayish discoloration in the skin.
Frostbite can lead to loss of a body part.
The victim should get out of the cold to a warm area and get medical attention. Hypothermia occurs when the inner body temperature becomes dangerously low as a result of prolonged exposure to the cold. Other signs include a very low heart rate, slowed breathing and low body temperature. The victim should receive medical attention as soon as possible. Other Tips Have a physical exam before starting a sport.