When summer heat settles into Cleveland, whether you’re out walking the Greenway or spending the afternoon at Fletcher Park, it’s important to know the difference between heat exhaustion and the more serious, life-threatening heatstroke. Recognizing the early signs and acting quickly can make all the difference. What Is Heat Exhaustion and How It Starts Heat exhaustion happens when your body overheats gradually, often due to a mix of high temperatures, humidity, and physical ...