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Why can a sudden vestibular problem cause vertigo?

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A sudden vestibular problem causes vertigo primarily due to a disruption in the reciprocal relationship between the two inner ears. Under normal conditions, the vestibular systems of both ears work in cooperation and opposition to maintain balance and orientation.1

When the vestibular function of one ear is suddenly damaged or altered, the activity of the two ears becomes unbalanced. The brain receives conflicting signals because the uninjured ear continues to function normally, while the affected ear provides inaccurate or absent information. This "unrestrained activity" from the healthy ear creates a false, persistent sensation that the environment is spinning or tilting.12

This imbalance often triggers nystagmus—rhythmical, involuntary eye movements—as the brain attempts to compensate for the perceived motion. These symptoms typically persist until the central nervous system can adapt and compensate for the loss or change in vestibular input, a process that may take days or weeks.21