Which symptom indicates that a person might be experiencing heat exhaustion rather than heat stroke?

The presence of cool, clammy skin is a significant indicator that a person is likely experiencing heat exhaustion rather than heat stroke. In cases of heat exhaustion, the body is still able to produce sweat, which helps regulate temperature, but the individual may be suffering from symptoms like fatigue, headache, nausea, and weakness. The cool, clammy skin occurs because the body's cooling mechanisms are still functioning to some extent.

In contrast, heat stroke is a much more severe condition where the body's temperature-regulating mechanisms have failed. Individuals experiencing heat stroke will typically present with hot, dry skin due to the body's inability to sweat and cool itself. High body temperature is more pronounced in heat stroke and can be life-threatening if not treated promptly. Additionally, a lack of perspiration is characteristic of heat stroke, further indicating that the body's systems are overwhelmed. Thus, recognizing cool, clammy skin can help differentiate heat exhaustion from the more severe condition of heat stroke, guiding appropriate first aid and treatment responses.