 And it turns into heat stroke after a matter of days. So keep an eye out for the symptoms of both. Bear River Health Department has some great information on this. I've linked to on our Facebook page. But, you know, fatigue, rapid heart rate inexplicably. I mean, you haven't just run a marathon, but your heart's beating like you have. Confusion, headache. All of these can be signs of heat stroke. Dry skin.