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Signs of heat stroke in outdoor activities — what should I look for?

April 5, 2026

Quick Answer

Look for signs of heat exhaustion such as heavy sweating, pale skin, fast and weak pulse, nausea or vomiting, and dizziness or fainting. If symptoms worsen, heat stroke is possible, characterized by high body temperature, altered mental state, and seizures or coma. Seek medical attention immediately.

Recognizing Heat Stroke Symptoms

Recognizing heat stroke symptoms early is crucial in preventing long-term damage or even death. Monitor individuals participating in outdoor activities, especially children, older adults, and those with pre-existing medical conditions. Check for these red flag signs: body temperature above 103°F (39.4°C), confusion or slurred speech, seizures or coma, and dry, flushed skin with no sweating.

Prevention Measures

Prevention is key to avoiding heat stroke. Stay hydrated by drinking at least 16-20 ounces of water every 30 minutes in extreme heat. Take regular breaks in shaded or air-conditioned areas to cool down. Avoid strenuous activities during peak sun hours (10am-4pm). Use sunscreen, a hat, and protective clothing to shield yourself from the sun. Additionally, consider the heat index, which combines temperature and humidity to estimate the perceived temperature.

Treatment and Response

If you suspect someone has heat stroke, respond quickly and effectively. Move the person to a shaded area or an air-conditioned space. Remove excess clothing and apply cool water to the skin. Use a fan to circulate air and speed up cooling. Do not give the person anything to drink, as this can cause vomiting. Call for emergency medical services immediately, as heat stroke is a medical emergency that requires prompt attention.

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