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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

First Aid for Heat Exhaustion

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

Heat exhaustion occurs when the body overheats and loses vital water and electrolytes through excessive sweating in hot conditions. If left untreated, it can rapidly progress to life-threatening heat stroke. Prompt first aid focuses on lowering core body temperature, resting in a cool environment, and safely replenishing fluids.

Quick Summary

Immediately move the person to a cool space, loosen tight clothing, apply cool damp cloths or mist, and provide slow sips of water or an electrolyte solution.

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.

Frequently Asked Questions

How can I tell the difference between heat exhaustion and heat stroke?
Heat exhaustion typically involves heavy sweating, cold or clammy skin, weakness, dizziness, and mild nausea. Heat stroke is characterized by an internal temperature above 103°F (39.4°C), hot red skin (which may be dry or damp), mental confusion, slurred speech, vomiting, seizures, or loss of consciousness.
What are the best fluids to drink for heat exhaustion?
Cool water, commercial sports drinks, or oral rehydration solutions are best because they replenish both fluid and lost sodium. Avoid alcoholic beverages, caffeinated sodas, and energy drinks, as they can worsen dehydration.
How long does it take to recover from heat exhaustion?
Most people begin feeling relief within 30 to 60 minutes of cooling and resting. However, full physiological recovery often takes 24 to 48 hours, during which the individual should rest, hydrate, and strictly avoid further heat exposure.
When should I call 911?
Call emergency services immediately if the person exhibits altered mental status (confusion, agitation, lethargy), faints, begins vomiting persistently, or fails to improve after 30 to 60 minutes of first aid cooling measures.
  1. 1
    Centers for Disease Control and Prevention (CDC)Source
  2. 2
    Mayo ClinicSource
  3. 3
    National Health Service (NHS)Source

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