Which of the following is a symptom of heat exhaustion?

Heat exhaustion is a condition that occurs when the body becomes overheated, typically due to prolonged exposure to high temperatures combined with high humidity and physical exertion. One of the key symptoms of heat exhaustion is clammy or pale skin. This symptom results from the body's attempt to regulate temperature by sweating, which can lead to moisture on the skin while also causing vasodilation, resulting in pale skin due to a decrease in blood flow to the surface.

In contrast, hot and dry skin is more characteristic of heat stroke, which is a more severe heat-related illness. Reduced or no sweating is also associated with heat stroke rather than heat exhaustion, indicating the body's inability to cool itself effectively. Elevated blood pressure can occur due to various factors but is not a definitive symptom of heat exhaustion, as the condition often leads to low blood pressure due to dehydration and the body’s effort to maintain blood flow to critical areas.

Understanding these symptoms is critical for taking appropriate measures to prevent further health complications, especially in situations involving prolonged exposure to high temperatures.