Heat exhaustion results when the body gets too hot because one fails to replace liquid lost through perspiration. It is critical that it is treated immediately because it can lead to heat stroke, a life-threatening situation.
Symptoms include: heavy sweating, malaise, palpitations, thirst, faintness, nausea, vomiting, weakness, headache, and muscle cramps.
Find a cool place, drink one to two quarts of cool water with about 1/2 teaspoon salt (if available), and lie down. Loosen or remove clothing and spray water on the body or place a cold water compress on the skin.