What symptom is most associated with vertigo?

Dizziness is the symptom most associated with vertigo because vertigo specifically refers to a sensation of spinning or movement, often described as feeling like you or the environment around you is moving or rotating. This sensation is fundamentally linked to balance and spatial orientation disturbances, which are core features of vertigo. Patients experiencing vertigo commonly report dizziness as the primary complaint, which can affect their ability to stand or walk and may lead to disorientation or a feeling of imbalance.

Other symptoms that might accompany vertigo, such as nausea, could result from the dizziness or the body's response to the disorienting situation. However, dizziness itself is the hallmark experience directly tied to vertigo's definition and clinical presentation. Thus, the strong association between dizziness and vertigo makes it the correct answer in this context.