An environmental emergency scenario presents a patient with nausea and headache and cool, clammy skin after exposure to hot conditions. Which diagnosis is most consistent with this presentation?

• A. Heat exhaustion
• B. Heat stroke
• C. Frostbite
• D. Hypothermia

Answer: (A)

Nausea and headache with cool, clammy skin after heat exposure point to heat exhaustion. This condition happens when the body’s cooling mechanisms (mainly sweating) are overwhelmed by prolonged heat and dehydration, leading to reduced circulating volume and electrolyte imbalance. Skin tends to be moist and cool to the touch, and symptoms often include fatigue, weakness, dizziness, nausea, and a rapid pulse, with a normal to only mildly elevated body temperature.

Heat stroke would present differently. The body’s cooling systems fail, core temperature rises above 40 C (104 F), and there is usually altered mental status such as confusion or seizures; skin may be hot and dry or wettened but is not characteristically cool and clammy.

Cold-related conditions don’t fit this scenario either. Frostbite involves freezing of tissue with numbness and pale or white areas on exposed skin, while hypothermia results from cold exposure and typically includes shivering (early) followed by confusion and slowed metabolism as the body temperature falls.

So the presentation most closely matches heat exhaustion, reflecting dehydration and heat exposure with symptoms like nausea, headache, and cool, moist skin.