Heat exhaustion is a condition that occurs when the body is unable to regulate its internal temperature and becomes dehydrated. The causes and symptoms are very recognizable and luckily, preventable. Causes of Heat Exhaustion: Physical exertion in warm, high- humidity weather Dehydration Alcohol use, drug use, or smoking Certain medications and illnesses can increase risk Children and the elderly are at higher risk Symptoms of Heat Exhaustion: Profuse sweating Dizziness or lightheadedness Pale, cool, clammy ...