What is one symptom of heat exhaustion?

Nausea is a common symptom of heat exhaustion, which occurs when the body overheats due to prolonged exposure to high temperatures or strenuous physical activity in hot conditions. This condition can cause various symptoms as the body struggles to maintain its normal temperature. Alongside nausea, individuals may experience dizziness, weakness, headache, and excessive sweating. These symptoms are a result of the body's mechanism to cool down and indicate that immediate action is necessary to prevent progression to heat stroke, a more severe and potentially life-threatening condition.

Other options, such as high blood pressure, convulsions, and frostbite, do not correlate with heat exhaustion. High blood pressure can be influenced by many factors and is not a direct symptom of heat exhaustion. Convulsions typically occur in more severe heat-related illnesses, like heat stroke, rather than in heat exhaustion. Frostbite, on the other hand, is related to exposure to freezing temperatures rather than heat, making it an irrelevant choice in this context.