Heat exhaustion

Heat exhaustion is one of the heat-related syndromes, which range in severity from mild heat cramps to heat exhaustion to potentially life-threatening heatstroke.

Signs and symptoms of heat exhaustion often begin suddenly, sometimes after excessive exercise, heavy perspiration and inadequate fluid intake. Signs and symptoms resemble those of shock and include:

bulletFeeling faint
bulletNausea
bulletAshen appearance
bulletRapid heartbeat
bulletLow blood pressure
bulletHot, red, dry or sweaty skin
bulletLow-grade fever, generally less than 104 F

If you suspect heat exhaustion:

bulletGet the person out of the sun and into a shady or air-conditioned location.
bulletLay the person down and elevate the feet slightly.
bulletLoosen or remove the person's clothing.
bulletHave the person drink cool water, not iced, or a sports drink containing electrolytes.
bulletCool the person by spraying him or her with cool water and fanning.
bulletMonitor the person carefully. Heat exhaustion can quickly become heatstroke. If fever — especially greater than 104 F, fainting, confusion or seizures occur, dial 911 or call for emergency medical assistance

 

By Mayo Clinic staff