SSCD:  Vertigo from sound and pulsing vertigo  

Superior semicircular canal dehiscence causes many symptoms depending on how large the hole in the canal becomes.  The best-known type is vertigo caused by loud sounds.  Normally the sound wave passes harmlessly by the semicircular canals and enters the cochlea, the hearing part of the ear.  However, when there is a hole in the canal, the sound waves can pass into the canal and through the opening.  This causes fluid movement in the canal which is sensed as spinning.  There are other symptoms as well, and these can be severe.

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When the inner ear leaks, sound causes vertigo

The balance parts of the inner ear—the labyrinths–are filled with fluid and surrounded by the bone of the skull.  They are designed to sense only tiny movements of fluid caused by moving the head, so they need to be protected from other things that could cause fluid movement.  Right next door to the labyrinth is  the hearing part of the ear, the cochlea, which also senses fluid movement. In the cochlea this fluid movement is caused by a pressure wave from sound entering the inner ear through a thin membrane. The sound waves go right past the labyrinth and head straight into the cochlea, so only sound is heard and no motion is felt.  As long as the bone protects and surrounds the labyrinth, this system works perfectly.  Sometimes, though, the bone protecting the labyrinth is cracked or a hole forms, and suddenly a new problem shows up:  sound can be felt as spinning. 

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