Heat exhaustion is a systemic heat emergency featuring which of the following?

• A. Exertion in a warm environment with dizziness, weakness, nausea, and tachycardia
• B. Severe dehydration with unconsciousness
• C. Excessive sweating and cold skin
• D. Confusion with hot, dry skin only

Answer: (A)

Heat exhaustion is a systemic heat illness that happens during or after exposure to heat when the body’s cooling and fluid mechanisms are overwhelmed. The best description is exertion in a warm environment with dizziness, weakness, nausea, and tachycardia because these symptoms reflect reduced circulating volume and the body's attempt to cool itself while maintaining perfusion. In heat exhaustion, people are usually sweating and still relatively responsive, with moist skin and no severe mental status change. The other scenarios point to different levels or types of heat illness: unconsciousness with severe dehydration suggests a more extreme dehydration or a progression to heat stroke; excessive sweating with cold skin isn’t typical of heat exhaustion and suggests poor perfusion or a different issue; confusion with hot, dry skin aligns with heat stroke, where the body can’t dissipate heat and mental status is altered with dry skin.