These cramps are caused by a lot of sweating. Heat cramps are painful muscle spasms in the arms, legs and mid-section. One must stop activity and drink plenty of water in order to get better. If not, it will lead to heat exhaustion. Heat Exhaustion .
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 . Heat stroke is extremely serious and can be fatal. Requires immediate medical attention. Cold Weather Risks Frost bite .