This occurs when there is unilateral pressure difference between middle & inner ear.
More common during ascent then descent.


sudden transient vertigo – usually less than one minute.
overwhelming feeling of disorientation.
vertigo may persist on the surface.
accompanied with nausea, vomiting, nystagmus.
no tinnitus


usually not required = transient.
decongestants may speed recovery, 
(occasionally a myringotomy is required.)

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