BPPV

BPPV, or Benign paroxysmal positional vertigo, is a special kind of vertigo. It's caused by small calcium carbonite crystals called otoconia in the inner ear moving from areas called the utricle and saccule to the semicircular canals. They don't belong there. As they move through the semicircular canals the brain perceives movement where there is none. In response the eyes move to keep up with the perceived motion then correct back to a neutral position. This eye movement is called nystagmus and is what contributes to the feeling of a spinning room. Once the otoconia stop moving so does the room.