Which sign suggests heat stroke rather than heat exhaustion?

• A. No sweating
• B. Sweating
• C. Pale skin
• D. Headache

Answer: (A)

The key idea is how the body's cooling system behaves in different heat illnesses. Sweating is the main way the body sheds heat, and in heat exhaustion the person is usually still sweating as it tries to cool down. In heat stroke, that cooling mechanism can fail, and sweating often stops, leaving the skin hot and dry or markedly dehydrated. So the sign that points to heat stroke rather than heat exhaustion is a lack of sweat. Headache can occur in either condition, and pale skin isn’t a reliable differentiator, since skin color varies with circulation and hydration. If heat stroke is suspected, it’s a medical emergency: call for help, move the person to a cooler place, remove excess clothing, and begin cooling the body with water and fans while awaiting aid.