Benign Positional Vertigo
From Expert System: Vertigo (dizziness)
Benign positional vertigo (BPV) is caused by sandlike grains ("otolithic debris") floating free in the inner ear (specifically, in the labyrinth) that disrupt the sense of balance. The typical history is of acute vertigo lasting less than a minute that occurs within 1-4 seconds with lying supine, sitting up, rolling over in bed, or other sudden head movements such as tilting the head backwards in reaching for an object, etc. While other causes of vertigo are made worse by sudden head movements, vertigo in these conditions, in contrast to BPV, almost always lasts more than a minute.
Benign positional vertigo can also occur in the course of vertigo due to specific causes, such as trauma or infection. Overall, benign positional vertigo is the most common type of paroxysmal vertigo, especially over the age of 50.
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