Heat exhaustion is primarily caused by which factor?

Heat exhaustion is primarily the result of exposure to high temperatures coupled with high humidity levels. This condition occurs when the body loses an excessive amount of fluids and electrolytes, often through sweating, and is unable to maintain a normal temperature. High humidity makes it difficult for sweat to evaporate, which is the body's natural mechanism for cooling itself. When the evaporation process is hindered, the body can overheat, leading to heat exhaustion.

In environments with both high temperatures and high humidity, individuals are particularly at risk since their bodies struggle to cool down effectively. Symptoms of heat exhaustion may include heavy sweating, weakness, dizziness, headache, and nausea, indicating that immediate hydration and cooling measures are essential to prevent progression to heat stroke, a more severe condition.

Other factors such as excessive hydration, exposure to cold temperatures, or lack of physical activity do not contribute significantly to the development of heat exhaustion. In fact, excessive hydration can sometimes aid in preventing dehydration, while cold temperatures are not associated with this condition at all.