Heat exhaustion is dangerous and can lead to death.<br />Heat exhaustion symptoms include rapid pulse, nausea, fatigue, and lightheadedness. <br />Heat exhaustion usually happens in hot, humid environments when the body is dehydrated and can't cool itself properly.<br />There are simple ways to prevent this.<br />Stay hydrated.<br />Try to avoid exercising, or otherwise exerting yourself, during the hottest parts of the day.
