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A symptom of heat stroke is a rapid pulse. During heat stroke, the body's temperature regulation fails due to prolonged exposure to high temperatures, often combined with dehydration. This causes the heart rate to increase as the body attempts to cool itself and maintain adequate blood circulation.

In contrast, excess sweating is typically associated with heat exhaustion rather than heat stroke. While increased body temperature may lead to sweating initially, heat stroke often presents with dry skin, as the body can no longer sweat effectively. Increased appetite is not a recognized symptom of heat stroke; instead, individuals may feel nauseated or even lose their appetite altogether. Mild headaches can occur in various conditions, but they do not specifically indicate heat stroke. Therefore, the noticeable symptom of elevated heart rate is a more accurate indicator of serious heat-related illnesses like heat stroke.