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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medically reviewed by WellAlly Editorial TeamLast reviewed October 19, 2026Editorial policy
First Aid18 min read

Heat Exhaustion First Aid and Treatment

Published: October 19, 2026Updated: October 19, 2026

Heat exhaustion occurs when the body overheats and loses vital water and electrolytes through heavy perspiration, often during physical exertion or high ambient temperatures. If recognized and addressed promptly with cooling and fluids, symptoms usually resolve without lasting complications. Without rapid intervention, heat exhaustion can quickly escalate into heat stroke, a life-threatening medical emergency.

Quick Summary

Move the person to a cooler environment, loosen their clothing, apply cool water to their skin, and provide sips of water or electrolyte drinks while monitoring closely for signs of heat stroke.

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

1

Move to a cool environment

Immediately bring the affected individual out of direct sunlight and into an air-conditioned room or a shaded, well-ventilated space. Have them sit down or lie flat to reduce physical exertion and allow their body to begin shedding excess heat.

Important: Do not leave the person unattended, as their condition can deteriorate rapidly into heat stroke.

2

Loosen and remove excess clothing

Remove unnecessary layers such as jackets, hats, shoes, and socks. Unbutton or loosen tight garments to maximize skin exposure to the air, which facilitates natural heat dissipation.

3

Actively cool the body

Apply cool, damp washcloths to the skin, mist them with cool water, or use an electric fan to promote evaporative cooling. Placing wrapped cool packs or damp cloths on major blood vessels in the neck, armpits, and groin accelerates core temperature reduction.

Important: Do not use ice baths or extremely cold water for heat exhaustion, as intense shivering can paradoxically increase core body temperature.

4

Rehydrate with cool fluids

Encourage the person to slowly sip cool water, oral rehydration solutions, or electrolyte-rich sports drinks. Replenishing lost fluid and essential minerals like sodium helps restore normal circulatory volume and muscle function.

Important: Do not give fluids if the person is vomiting, confused, or losing consciousness, as this presents a severe choking hazard.

5

Elevate the legs

If the person experiences lightheadedness, dizziness, or a weak pulse, have them lie on their back and elevate their feet approximately 6 to 12 inches. This position promotes venous blood return to the heart and brain, counteracting heat-induced low blood pressure.

6

Monitor for deterioration and emergency signs

Continuously observe the person for at least 30 to 60 minutes after beginning treatment. Ensure their symptoms, such as headache, nausea, and heavy sweating, steadily improve as their body cools down.

Important: Call 911 immediately if the person develops confusion, slurred speech, seizures, persistent vomiting, loss of consciousness, or if symptoms fail to improve within 30 minutes.

Frequently Asked Questions

What is the key difference between heat exhaustion and heat stroke?
Heat exhaustion presents with heavy sweating, pale or clammy skin, dizziness, and intact mental status. Heat stroke is a medical emergency defined by central nervous system dysfunction—such as confusion, agitation, or unconsciousness—and often an extremely high body temperature exceeding 103°F (39.4°C).
How long does it take to recover from heat exhaustion?
Most people begin feeling significantly better within 30 to 60 minutes of rest, cooling, and rehydration. However, full physiological recovery generally requires 24 to 48 hours of rest and continued fluid intake, and individuals remain more sensitive to heat during this period.
What are the best drinks for treating heat exhaustion?
Cool water, electrolyte-replacement sports drinks, and diluted fruit juices or commercial oral rehydration salts are best. Avoid caffeinated drinks, energy drinks, and alcohol, as they can worsen dehydration.
When should emergency medical services be called?
Call emergency services immediately if the person faints, becomes disoriented, starts vomiting uncontrollably, has a seizure, or does not improve after 30 minutes of first aid.
  1. 1
    Centers for Disease Control and Prevention (CDC)Source
  2. 2
    Mayo ClinicSource
  3. 3
    National Health Service (NHS)Source
  4. 4
    MedlinePlus - National Library of MedicineSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

Medical Disclaimer

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