People most likely to faint in the heat are those unused to working in it. Heat exhaustion is caused by excessive sweating. Nausea, giddiness, thirst and headache are common symptoms of this problem. Body temperature may or may not be higher than normal. People vary widely in how much tolerance they have for heat, making it sometimes difficult to foresee this problem.
Treatment includes cooling the victim and giving liquids.
Take the victim to a cool place, resting in a head-low position. Keep the victim warm enough to avoid shock. Keep at rest. The victim should be watched for further problems. Heatstroke is a life-threatening situation.