Dizziness is a vague and nonspecific symptom. It refers to an abnormal sensation in relation to space and position. Vertigo is a specific type of dizziness that is defined as a spinning or rotatory sensation. Patients with vertigo report that things are rotating around them or that they are rotating around things.
Vertigo could be either from a peripheral (labyrinth and vestibular nerve) or a central disorder (central nervous system). Central vertigo is usually a result of an abnormal processing of the vestibular sensory input by the central nervous system.
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The sensation of balance is the result of appropriate information detected by the vestibular, ocular, and proprioceptive sensory receptors that is then properly integrated within the cerebellum and brain stem. Proper gait, posture, and visual focus during head movement all depend on an intact sense of balance. Loss of sensory information, central integration, and output control mechanisms all result in a sense of imbalance.
Central causes of vertigo result from either a disruption of central integrators (ie, brain stem, cerebellum) or a sensory information mismatch (ie, from the cortex). Lesions that affect the vestibular nerve or root entry zone (ie, cerebellopontine angle [CPA] lesions) result in imbalance by affecting primary vestibular sensory information.
No racial predilection exists for CNS causes of vertigo.
Men and women are affected differently by different causes of CNS vertigo. Vestibular migraine, for example, shows a predilection for women.
CNS causes of vertigo typically affect older population groups because of the associated risk factors of vascular causes of vertigo, such as hypertension, atherosclerosis, and diabetes mellitus. 
Younger population groups are more commonly affected by migraine headaches and multiple sclerosis (MS).  Cerebellar tumors affect a bimodal population of children and adults. CPA tumors typically affect people in the fifth to eighth decades of life.
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