What is a primary symptom that differentiates heat exhaustion from heat stroke?

A primary symptom that differentiates heat exhaustion from heat stroke is having a normal body temperature. Heat exhaustion occurs when the body becomes overheated, but it typically does not cause the body temperature to rise to dangerous levels, which generally remains below 104°F (40°C). Individuals experiencing heat exhaustion might show symptoms such as heavy sweating, weakness, and normal body temperature, allowing them to cool down effectively.

In contrast, heat stroke is a more severe condition where the body temperature typically rises above 104°F (40°C), and then the body's cooling mechanisms fail. Other symptoms of heat stroke may include confusion, altered mental status, and lethargy, which indicate a medical emergency and require urgent care. The differences in body temperature and the related physiological responses are crucial in distinguishing between these two heat-related illnesses.