What typically causes exertional heat exhaustion?

Exertional heat exhaustion primarily occurs due to inadequate fluid replacement during physical exertion, especially in hot and humid conditions. When the body is engaged in intense activity, it produces sweat to help cool down. However, if an individual does not replenish the fluids lost through sweating, it can lead to dehydration. As dehydration increases, the body struggles to regulate its temperature, leading to symptoms such as heavy sweating, weakness, dizziness, and fatigue.

Proper hydration is crucial in preventing heat-related illnesses, and failure to maintain adequate fluid levels during exercise or strenuous activities can set the stage for heat exhaustion. This condition is especially prevalent in athletes or individuals engaging in prolonged exercise in extreme temperatures.