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2. Vertigo and Vertebrobasilar Insufficiency

Feelings of vertigo or dizziness with no apparent cause may be the singular symptom that accompanies vertebrobasilar insufficiency; it is certainly the most common. The symptom is, in itself, a reason to seek immediate medical attention. Vertigo from a vertebrobasilar insufficiency can be brought on by turning the head to the side, which temporarily blocks the contralateral vertebral artery decreasing blood flow.

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