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Signs of heatstroke vs. heat exhaustion — what to know?

May 8, 2026

Quick Answer

Heatstroke and heat exhaustion are two distinct heat-related illnesses that require prompt recognition and treatment. Heat exhaustion is often characterized by heavy sweating, pale or flushed skin, and nausea or vomiting, while heatstroke is marked by a high body temperature, confusion, and even loss of consciousness. Identifying these signs is crucial for preventing serious complications.

Recognizing the Signs

Heat exhaustion and heatstroke can be challenging to distinguish, but there are key differences in their symptoms. Heat exhaustion typically begins with heavy sweating, pale or flushed skin, and a rapid pulse, alongside symptoms like nausea or vomiting, headaches, and fatigue. If the individual experiences a body temperature above 103°F (39.4°C), confusion, or altered mental status, it could be heatstroke.

Cooling and Hydration Techniques

To treat heat-related illnesses, cooling the body and replenishing fluids are crucial. For heat exhaustion, move the individual to a shaded area, remove excess clothing, and apply cool compresses or wet towels to the forehead, neck, and torso. Encourage sips of water or electrolyte-rich beverages, but avoid forcing the person to drink. For heatstroke, call 911 or seek immediate medical attention, as prompt treatment is essential. If the individual is unresponsive or has a seizure, start CPR if trained to do so.

Prevention is key in avoiding heat-related illnesses. When working or exercising outdoors, take regular breaks in shaded areas or air-conditioned spaces, and stay hydrated with electrolyte-rich beverages. Wear lightweight, light-colored clothing and a hat to protect yourself from direct sunlight. Avoid strenuous activities during peak heat hours (usually between 11 am and 3 pm). Monitor the temperature and humidity levels, and be aware of your body’s signs of heat stress, such as dizziness, nausea, or headaches.

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