We tend to categorize vertigo into two categories, central vertigo or peripheral vertigo. Central vertigo is not true spinning vertigo. It's not actually related to the vestibular system. It's really a central nervous system problem with central vertigo. Patients will describe a sense of lightheadedness, of swimming or floating type of feeling. And it's really chronic imbalance is what they tend to experience peripheral vertigo. On the other hand is directly related to the vestibular system. So the inner ear is the cause of the vertigo problem. With true peripheral vertigo, patients actually experience that spinning sensation. It can last anywhere from a few seconds to several hours, depending upon the cause.