Protect yourself and your family by knowing the signs of heat exhaustion and heatstroke. Their symptoms are similar and should always be taken seriously. Watch for dizziness, headache, nausea, loss of consciousness, and a fast or weakening pulse. With heat exhaustion, the skin is cold and pale, and feels clammy. Once heatstroke kicks in, body temperatures rise to 103 degrees or higher, and the skin becomes hot, red, dry, or damp because it stops sweating. If you or anyone else shows these symptoms, get medical attention immediately.