Seek immediate medical attention. Get the person out of the heat. If they are in the sun, get them into the shade or a cool building. Make sure the victim can breathe. If symptoms include uncontrollable muscle twitches, keep airways open by turning the victim onto his or her side.
Heat exhaustion occurs when the body loses excessive amounts of water and salt through sweating.
It is less severe than heat stroke. The person may feel tired, weak, dizzy, nauseous or faint. Warning signs include heavy sweating, headache. The skin may be cool and moist, the pulse rate fast and weak, and the breathing fast and shallow. People who work or exercise in the heat, elderly persons, and those with high blood pressure are most vulnerable.