Doctor Jessica Shepherd with Baylor University Medical Center of Dallas joined Good Day Sunday to give tips on preventing heat stroke and heat exhaustion. The C.D.C. lists symptoms of a heat illness as dizziness, a rapid pulse, nausea, headache and fainting. But symptoms can vary. Those suffering from heat stroke, which can be deadly, might have a rapid but strong pulse. Those with heat exhaustion might have a rapid but weak one. Immediate remedies include moving the person to a cooler place and applying wet, cool cloths. Call 911 if there is heat stroke, vomiting or if the symptoms get worse.