Heat exhaustion occurs due to high temperatures and dehydration. Signs include nausea, dizziness, headaches, cramps, and more. Heat exhaustion can progress to heat stroke if not treated quickly. Anyone experiencing signs of heat exhaustion should drink plenty of fluids, get into cool water (shower, bath, etc), and apply other cool items such as ice or cold compresses. Follow the links below to find WebMD's comprehensive coverage about how heat exhaustion is caused, symptoms, treatments, prevention, and more.