Heat Stroke vs Heat Exhaustion: Key Differences and First Aid

4. kol 2023.

Summer heat raises the risk of heat-related illness. Know how heat exhaustion and heat stroke differ so you can act fast and protect yourself or others.

Heat Exhaustion vs Heat Stroke

Heat exhaustion happens when prolonged heat exposure and inadequate fluids cause heavy sweating, weakness, dizziness, and fainting. It is serious but usually treatable outside a hospital.

Heat stroke is a medical emergency. Body temperature often climbs above 104°F (40°C), the person may stop sweating, and organs can be damaged quickly without prompt treatment.

How They Look

Someone with heat exhaustion often looks pale, sweaty, and tired. Skin feels cool and moist. They may be dizzy or weak.

Someone with heat stroke can have hot, dry skin, a very high temperature, and clear signs of neurological trouble such as confusion or disorientation.

Man with towel suffering from heat stroke outdoors

Signs and Symptoms

Watch for these warning signs so you can respond quickly.

Heat Exhaustion

1. Excessive sweating: The body cools itself by sweating heavily.
2. Pale or clammy skin: Skin may feel cool and moist.
3. Fatigue and weakness: The person may be unusually tired or weak.

Signs of neurological trouble like confusion or disorientation during heat illness warning signs and symptoms, heat exhaustion section mentioning excessive sweating and body cooling attempts.

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4. Dizziness and lightheadedness: May include vertigo.
5. Headache: Often throbbing or persistent. See also related tips.
6. Nausea and vomiting
7. Rapid heartbeat
8. Muscle cramps: Usually in legs or abdomen.
Tired woman suffering from heatstroke using a fan on the sofa

Heat Stroke

1. Very high body temperature: Often above 104°F (40°C).
2. Hot, dry skin: Sweating may stop, though sometimes it continues.
3. Rapid and strong pulse
4. Severe headache
Neurological symptoms including disorientation, coordination problems, trouble walking, or seizures and rapid, shallow breathing noted in the list of heat-related warning signs.
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5. Confusion and altered mental state: Disorientation, slurred speech, agitation, or seizures.
6. Loss of consciousness
7. Neurological symptoms: Coordination problems, trouble walking, or hallucinations.
8. Rapid, shallow breathing

What Causes Each

Causes of Heat Exhaustion

Heat exhaustion stems from long exposure to high temperatures combined with not enough fluids or electrolytes. Sweating depletes water and salts, and if you do not replace them, your body struggles to cool itself.

Man struggling with the intense sun, suffering from heatstroke outdoors

Causes of Heat Stroke

Heat stroke happens when the body cannot regulate temperature. Common causes include:

1. Prolonged exposure to high temperatures
2. High humidity: Reduces evaporation of sweat.
3. Physical exertion: Heavy activity in heat without enough fluids.
4. Dehydration
5. Certain medications or medical conditions: Some drugs and health issues make heat regulation harder.

Quick First Aid Steps

If you suspect heat exhaustion

  • Move the person to a cooler, shaded area.
  • Loosen tight clothing and have them lie down with feet elevated if they feel faint.
  • Give cool water or an electrolyte drink, small sips at a time.
  • Apply cool, wet cloths or a cool bath to help lower body temperature.
  • Monitor closely. If symptoms worsen or do not improve within 30 minutes, get medical help.

If you suspect heat stroke

  • Call emergency services immediately.
  • Move the person to a cooler place and remove excess clothing.
  • Cool the person quickly with whatever is available: cold water immersion, cool showers, or wet towels and fans.
  • If trained, monitor airway and breathing. Be ready to perform CPR if needed.

Prevention Tips

Reduce risk with simple habits: drink fluids regularly, avoid strenuous activity in the hottest hours, wear lightweight clothing, use sunscreen, and take frequent breaks in the shade or an air-conditioned spot. Check on older adults and young children, and watch people on medications that affect heat tolerance.

Knowing the difference between heat exhaustion and heat stroke saves time and lives. Act quickly, cool the person, and call for help when needed.

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