Heat exhaustion is one of the heat-related syndromes. Symptoms range in severity from mild heat cramps to heat exhaustion to potentially life-threatening heatstroke. Heat exhaustion can begin suddenly, usually after working or playing in the heat, perspiring heavily or being dehydrated.

Heat exhaustion signs and symptoms include:

• Faintness or dizziness
• Nausea or vomiting
• Heavy sweating often accompanied by cold, clammy skin
• Weak, rapid pulse
• Pale or flushed face
• Muscle cramps
• Headache
• Weakness or fatigue

If you suspect heat exhaustion

Untreated, heat exhaustion can lead to heatstroke, which is a life-threatening condition. If you suspect heat exhaustion, take these steps immediately:

• Move the person out of the heat and into a shady or air-conditioned place.
• Lay the person down and elevate the legs and feet slightly.
• Remove tight or heavy clothing.
• Have the person drink cool water or other nonalcoholic beverage without caffeine.
• Cool the person by spraying or sponging with cool water and fanning.
• Monitor the person carefully.

Call 911 or your local emergency number if the person’s condition deteriorates, especially if he or she experiences:

• Fainting
• Confusion
• Seizures
• Fever of 104 F (40 C) or greater