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Heavy sweating and weakness are hallmark symptoms of heat exhaustion. This condition typically occurs when the body overheats, often due to prolonged exposure to high temperatures or strenuous physical activity. The body attempts to cool itself through sweating, leading to loss of fluids and electrolytes. As a result, the individual may experience excessive sweating, which can be accompanied by feelings of weakness and fatigue. Recognizing these symptoms early is critical, as it allows for prompt treatment to prevent progression to more severe heat-related illnesses, such as heat stroke.

The other symptoms listed, while related to heat-related conditions, do not specifically define heat exhaustion as clearly as heavy sweating and weakness. For instance, confusion might indicate a more severe condition or dehydration but is not as distinctively linked to heat exhaustion. The presence of nausea and vomiting can also suggest dehydration or heat cramps, further complicating diagnosis without the context of significant sweating and weakness.