The major causes of dizziness are middle and inner ear infections and problems affecting the cerebellum (part of the brain that controls balance and spatial orientation). An ear infection may respond to antibiotics but sometimes surgery is necessary to relieve pressure in the middle or inner ear. Feline leukemia virus, feline immunodeficiency virus, toxoplasmosis and other infectious diseases can lead to balance problems. Cats do sometimes get infarcts in the brain with similar effects to strokes in humans. Cancer can cause these signs, as well.