Loose otoconia: The most accepted hypothesis for benign positional vertigo is loose otoconia (calcium carbonate crystals) from the utricle ( a structure in the inner ear). When you move your head in a critical position, these crystals move and stimulate the inner ear balance mechanism and the room spins around (vertigo) for 10 to 30 seconds. It is usually self limited and can respond to head exercises.
Answered 12/18/2018
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