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Vertigo, a symptom of a balance disorder, is the illusion of movement when no movement is present. This can be caused by a problem of the inner ear balance mechanisms, or by a problem in the brain. it is always a good idea to consult a doctor. The same is true if the episodes worsen over time or if new symptoms appear.To diagnose vertigo, a physician may perform a series of tests. The most common diagnostic tests are a hearing examination, an electronystagmography or test of the vestibular system, and cat scans of the brain.