Which of the following symptoms is typically associated with heat exhaustion?

Heavy sweating is a primary symptom associated with heat exhaustion, as this condition occurs when the body overheats due to prolonged exposure to high temperatures or vigorous physical activity in hot weather. The body's natural response to overheating is to sweat in order to cool down through evaporation. In cases of heat exhaustion, this sweating becomes excessive, which can lead to additional symptoms such as dehydration, fatigue, and weakness.

While increased thirst and elevated heart rate may also occur during heat exhaustion, heavy sweating is a hallmark sign that specifically indicates the body's attempt to regulate temperature under stressful heat conditions. Allergic reactions, on the other hand, are unrelated to heat exhaustion and involve the immune system responding to allergens rather than environmental heat stress. Understanding these connections helps in recognizing the signs of heat-related illnesses and responding appropriately.