Orthostatic intolerance is characterized by symptoms like lightheadedness that occur when standing. This happens due to a failure in the body's ability to maintain blood flow and pressure. The correct answer among the options provided is lightheadedness. ;
The correct answer to the question is lightheadedness, as it is a symptom of orthostatic intolerance. This condition occurs when the body struggles to manage blood flow and pressure when standing up. Other options listed do not typically relate to this condition.
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