It is a very common disorder that causes a characteristic nystagmus depending on the duct that presents the accumulation of otoconia and that produces an episodic vestibular syndrome of short duration, usually less than a minute. It usually occurs when lying down, when the patient turns in bed, or when lowering the head. The subject perceives a rotation of objects with changes in position, although the elderly describe instability. All of this can be accompanied by nausea or vomiting.

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The diagnosis is based on the detection of the characteristic symptoms described and on exploratory tests. These include the Dix-Hallpike test and the head rotation or McClure test.  With them you can determine the affected channel and the presence of the problem in one or two ears.