This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
First Aid for Heat Exhaustion
Heat exhaustion is a heat-related illness that occurs when your body overheats, typically due to prolonged physical exertion in high temperatures. Common symptoms include profuse sweating, weakness, dizziness, nausea, and a rapid pulse. Immediate cooling and rehydration are vital to prevent the condition from progressing to life-threatening heat stroke.
Quick Summary
Move the person to a cool area, loosen tight clothing, apply cool damp cloths to the skin, and provide small sips of cool fluids.
Important Medical Disclaimer
This guide is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult with qualified healthcare providers for medical concerns.
Step-by-Step Guide
Recognize the signs of heat exhaustion
Look for heavy sweating, cold or clammy pale skin, muscle cramps, dizziness, headache, nausea, and general weakness. Ensure the person is fully awake, alert, and able to respond to questions. Differentiate these symptoms from heat stroke, which is a life-threatening emergency.
Important: If the person becomes confused, loses consciousness, vomits repeatedly, or has hot, red skin, call 911 or your local emergency number immediately.
Move to a cooler environment
Immediately escort or assist the person away from direct sunlight and heat. Move them into an air-conditioned building or vehicle whenever possible. If indoors is not an option, find a shady, well-ventilated outdoor spot and have them lie down with their legs slightly elevated to assist blood flow.
Loosen and remove excess clothing
Unbutton collars, loosen belts, and take off heavy or restrictive clothing such as jackets, socks, and shoes. Exposing more skin to circulating air accelerates the natural evaporation of sweat. Ensure the person remains comfortable while shedding unnecessary layers.
Apply active external cooling measures
Place cool, damp cloths or towels on areas with high blood flow near the skin surface, including the neck, armpits, forehead, and groin. Use an electric or handheld fan to circulate air over the damp skin to facilitate evaporative cooling. You may also mist the person with room-temperature or cool water.
Important: Do not submerge the person in an ice bath or use freezing water for mild heat exhaustion, as intense shivering can paradoxically raise internal core body temperature.
Provide cool fluids in small sips
Offer cool water, an oral rehydration solution, or an electrolyte sports drink. Encourage the individual to drink slowly in small, frequent sips rather than gulping down large volumes. Avoid beverages containing alcohol or caffeine, as they promote dehydration.
Important: Never force fluids into anyone who is vomiting, drowsy, confused, or unable to swallow safely.
Rest and monitor closely for improvement
Keep the person resting quietly in a cool area and monitor their heart rate, breathing, and mental status. Symptoms should begin to improve noticeably within 30 minutes of initiating cooling and fluid replacement. Advise them to avoid heavy physical activity and heat exposure for the remainder of the day.
Important: Seek immediate medical attention if symptoms fail to improve after 30 to 45 minutes or if the person begins vomiting.
Frequently Asked Questions
What is the difference between heat exhaustion and heat stroke?
How long does it take to recover from heat exhaustion?
Who is at highest risk for heat exhaustion?
Can heat exhaustion turn into heat stroke?
Sources & References
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This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed October 19, 2026. · Read our editorial policy