This is brought on by fluid loss and partly by the fact that the body's cooling system has sent so much of its blood supply to the skin. This reduces blood flow to the brain and can produce confusion and even unconsciousness. A person with heat exhaustion has a wet skin. If you get heat exhaustion stop at once, get out of the sun, lie down, raise your feet, and cool off. Drink plenty of fluids.
Heat stroke is life threatening.
Other symptoms are dizziness, vomiting, diarrhea, and confusion. Immediate medical attention is required. The body temperature must be reduced at once with cool water, rubbing alcohol, or by putting the victim into a tub of cold water. Listen to your body. When you start to feel overheated stop exercising.