Signs of heat exhaustion can include which of the following?

Heat exhaustion is a serious condition that can occur when the body loses excessive amounts of fluid and salt, typically due to prolonged exposure to high temperatures, particularly when combined with physical activity. Signs and symptoms of heat exhaustion often involve physical distress that reflects the body's struggle to cope with overheating.

Dizziness, headache, and nausea are classic indicators of heat exhaustion. Dizziness can occur as the body struggles with hydration and circulation issues, especially when blood volume decreases due to excessive sweating and fluid loss. A headache can arise from dehydration or heat itself affecting the body’s thermoregulation. Nausea is also common as the gastrointestinal system reacts to the stress of heat on the body, which can exacerbate the feeling of sickness and further complicate hydration efforts.

This combination of symptoms serves as a warning that the individual may need to take immediate action to cool down, hydrate, and rest to prevent the progression to heat stroke, which is a more dangerous condition.

Other options provided, while they contain symptoms that could be related to physical distress, do not specifically correlate with the direct symptoms of heat exhaustion as clearly as dizziness, headache, and nausea do.