I found a 2021 study with this: Conclusion: Prodromal otological symptoms might be associated with a reduced risk of motor progression in PD.
Anyone know how often vertigo is a sign of PD? Last few days I've had small bouts of vertigo. Without warning the room begins to swim. Or rather it rotates.
Five years ago I had my first bout of vertigo. I was visiting family in Colorado. Ended up in the emergency ward with an MRI that suggested MS. I took high doses of IV steroids for three days. Later a dominant hand tremor led to a PD diagnosis. But the vertigo abated and I never developed other signs associated with PD: No slowness, no freezing, no balance problems. One neuro said there's no rule you can't have BOTH diseases.