Which symptom indicates heat stroke requiring EMS and aggressive cooling?

• A. Confusion, altered mental status, dry or very hot skin.
• B. Heavy sweating, weakness, dizziness.
• C. Chest pain and rapid pulse.
• D. Nausea and vomiting.

Answer: (A)

Heat stroke is a medical emergency where the body's cooling system fails and the brain is affected. The key sign is confusion or altered mental status paired with skin that is dry or very hot. The absence of sweating (dry skin) shows the body can’t regulate temperature, and the mental changes indicate the brain is being harmed by the heat. Because this combination signals a life-threatening condition, it requires immediate EMS dispatch and rapid cooling to bring the body temperature down.

Other symptoms you might see with less severe heat illness—for example, heavy sweating with weakness and dizziness—point toward heat exhaustion, not heat stroke, and while urgent care is still needed, it’s a different situation. Chest pain with a rapid pulse could reflect a cardiac event or dehydration-related strain, and nausea or vomiting can occur with heat illness too but don’t by themselves indicate heat stroke requiring immediate aggressive cooling.