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Suspected heatstroke is an emergency. Call your local emergency number immediately (911 in the United States; 999 in the United Kingdom), move the person to a cool place, remove excess clothing, and start rapid cooling while help is coming. Do not wait to see whether home treatment works.
Heat exhaustion and dehydration can often improve with prompt cooling, rest, and carefully given fluids, but they can progress to heatstroke. This first-aid guide helps you recognize the difference, act safely, and know when to escalate.
First, decide whether it could be heatstroke
Heatstroke is the most serious heat-related illness. The decisive warning is a change in brain function after heat exposure, not a particular skin appearance. Confusion, altered behavior, slurred speech, seizure, collapse, or loss of consciousness should be treated as heatstroke. CDC/NIOSH also lists a very high body temperature and either hot, dry skin or profuse sweating. A person can be sweating and still have heatstroke, so do not use sweating alone to rule it out.
If any of those neurological signs are present, call emergency services now. In the United States, CDC/NIOSH guidance uses 911; UK NHS and British Red Cross guidance uses 999. If you are elsewhere, use the local emergency number and tell the dispatcher that heatstroke is suspected.
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What to do for suspected heatstroke
- Call for help and stay with the person. Put the phone on speaker if possible so you can begin first aid immediately.
- Move them to a cool or shaded place. Remove outer or unnecessary clothing to expose more skin to cooling.
- Cool rapidly while waiting. If it is safe and practical, place the person in a cold-water or ice bath. Otherwise wet the skin with cold water, apply cold wet cloths or wrapped ice packs to the head, neck, armpits, and groin, and circulate air with fanning.
- Use a wet sheet if that is what you have. British Red Cross guidance describes covering the person with a cold, wet sheet and continually pouring cold water over it. If no sheet is available, sponge or spray cool water while fanning.
- Protect the airway. Do not give drinks to anyone who is confused, unconscious, vomiting, or unable to swallow safely. Keep watching their breathing and follow the emergency operator’s instructions. If they become unresponsive and are not breathing normally, begin CPR if you are trained and directed to do so.
Do not leave the person alone to fetch supplies, drive them yourself if an ambulance is available, or delay calling because the skin is still sweating. Cooling and professional care take priority over trying to replace fluids by mouth.
How heat exhaustion differs
Heat exhaustion usually follows substantial fluid and salt loss through sweating. British Red Cross descriptions include dizziness, headache, muscle cramps, nausea, pale skin, sweating with comparatively cool skin, and fast breathing or heart rate. CDC/NIOSH also lists weakness, irritability, thirst, heavy sweating, elevated body temperature, and reduced urine output.
The person remains responsive and can normally answer questions and swallow. If mental status changes, vomiting prevents drinking, or the person collapses, reassess it as a possible heatstroke emergency rather than continuing routine home care.
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First aid for heat exhaustion
- Move the person out of the heat. Use an air-conditioned room or a shaded, well-ventilated area. Have them rest, and loosen or remove unnecessary outer clothing.
- Cool the skin. Use cool water, wet cloths, sponging or spraying, and fanning. Continue until the person is comfortable and symptoms are clearly settling.
- Give fluids only when swallowing is safe. An alert person who can swallow normally can take small, frequent sips of water. NHS guidance also lists an isotonic drink or oral rehydration powder mixed with water as options for replacing salt lost through sweating. Do not force large volumes quickly.
- Arrange medical advice. NHS guidance says heat exhaustion should start to improve within 30 minutes of cooling. Treat that as NHS guidance, not a guarantee: seek urgent help sooner if symptoms are severe or worsening.
Call emergency services if confusion develops, the person vomits repeatedly, cannot drink, becomes faint or unresponsive, has a seizure, or fails to improve with cooling. Those changes can indicate heatstroke or another serious illness.
Understanding dehydration after heat exposure
Dehydration is a shortage of body fluid. In hot weather it commonly results from sweating during work, exercise, travel, or illness. It can occur by itself or accompany heat exhaustion. Thirst, weakness, dizziness, headache, and reduced urination are useful warning signs, but they do not tell you whether heatstroke is developing.
For a responsive person who can swallow, replace fluid gradually with water. When heavy sweating has also removed salt, an isotonic drink or correctly mixed oral rehydration solution can provide electrolytes; follow the product’s mixing directions. These drinks support recovery from fluid loss but never replace cooling or emergency assessment when heatstroke signs are present.
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Never pour liquid into the mouth of a confused, drowsy, vomiting, unconscious, or otherwise unsafe-to-swallow person. Aspiration can injure the lungs. Place the person safely on their side if they are vomiting or have reduced responsiveness, and call for medical help.
Quick comparison: dehydration, heat exhaustion, and heatstroke
| Condition | Typical clues | Immediate priority | Fluids by mouth |
|---|---|---|---|
| Dehydration | Thirst, weakness, dizziness, headache, or less urine after fluid loss | Stop heat exposure and replace fluid gradually | Only if alert and swallowing safely |
| Heat exhaustion | Heavy sweating, pale or cool skin, cramps, nausea, dizziness, weakness, fast pulse or breathing | Cool place, rest, skin cooling, and medical advice | Small frequent sips if fully responsive |
| Heatstroke | Confusion, altered behavior, slurred speech, seizure, collapse, loss of consciousness, very high temperature; skin may be dry or heavily sweaty | Emergency call and rapid active cooling | Do not give to a confused, vomiting, unconscious, or unsafe-to-swallow person |
When to escalate, even if it does not look like heatstroke
Get urgent medical help when symptoms are severe, the person is getting worse, or cooling does not produce clear improvement. Escalate immediately for confusion, fainting, seizure, collapse, repeated vomiting, inability to drink, or any loss of consciousness. A person with a serious heart, lung, kidney, or other chronic condition may need assessment earlier because heat and fluid loss can destabilize existing illness.
Do not use a thermometer reading, sweating pattern, or the person’s ability to describe symptoms as the only test. Heat illness can evolve quickly, and other emergencies can look similar. Tell clinicians when the exposure occurred, what activity the person was doing, whether they were able to drink, and what cooling you attempted.
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Preventing heat illness before it starts
- Plan fluid access. Carry a reusable water bottle and refill it; do not wait until you feel severely thirsty to find water.
- Build in cooling breaks. Use shade, air-conditioned spaces, or another cool location during outdoor work, exercise, travel, and events. Schedule demanding activity for cooler parts of the day when possible.
- Dress and pace for the conditions. Lightweight clothing, slower exertion, and regular rest reduce heat production and sweat loss.
- Check on other people. CDC recommends checking family, friends, and neighbors, especially anyone living alone or managing a chronic medical problem.
- Use indoor cooling appropriately. CDC advises using fans indoors only when the indoor temperature is below 90°F (about 32°C). Above that, use air conditioning or go to a cooling location rather than relying on a fan alone.
A bottle helps you carry water, but it does not treat heat illness once serious symptoms begin. Prevention also requires reducing heat exposure and recognizing early warning signs.
People who need extra monitoring
Heat can affect people differently. CDC identifies pregnant people, children and teenagers with asthma, and people with heart disease or other chronic conditions as groups needing particular attention. British Red Cross guidance also highlights young children, older adults, and people with chronic heart or lung disease or diabetes.
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Quick Recap
Common mistakes to avoid
- Waiting for dry skin. Heatstroke can include profuse sweating.
- Giving drinks to an altered person. Confusion, vomiting, or reduced consciousness makes swallowing unsafe.
- Stopping at rest alone. Move the person out of the heat and actively cool the skin.
- Waiting 30 minutes when heatstroke is possible. The NHS 30-minute improvement guidance applies to heat exhaustion after cooling, not to suspected heatstroke.
- Using a fan in a dangerously hot room as the only measure. CDC’s indoor fan advice is limited to rooms below 90°F; use air conditioning or a cooling center when it is hotter.
- Leaving someone unattended. Mental status and breathing can change while you are getting water or supplies.
A simple action plan to remember
- Look at the brain first: confusion, seizure, collapse, or unconsciousness means call emergency services and treat as heatstroke.
- Cool immediately: shade or a cool room, remove excess clothing, wet the skin, and fan; use a cold bath or wet sheet when available.
- Only offer fluids to a fully alert person who swallows safely.
- Reassess continuously: worsening symptoms, vomiting, inability to drink, or failure to improve requires urgent medical care.
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