 And then know the symptoms is critical as a sort of third piece of the mantra, because if you think you're staying cool and you're trying to stay hydrated, but your body's telling you things, you need to listen. And depending upon who you are, those may appear differently. For people with chronic conditions like diabetes, when you get dehydrated or overheated, your blood sugar is not going to be well controlled. It's going to be harder to control. People with heart disease may start experiencing the symptoms of their heart disease.