Vertigo is the feeling that you are spinning or the world is spinning around you. Benign paroxysmal positional vertigo is caused by a problem in the inner ear. It usually causes brief vertigo spells that come and go. For some people, BPPV goes away by itself in a few weeks.
Unilateral vestibular hypofunction (UVH) is a disorder that creates a reduced total or partial reduction in vestibular function on one side of the body. Patients with UVH frequently report symptoms such as dizziness, oscillopsia, postural instability and gait disorders.
Bilateral vestibular hypofunction (BVH) is a heterogeneous condition that results from defects in either the vestibular organs, eighth cranial nerves, or a combination of the two. This condition causes impairments in the vestibulo-ocular reflex (VOR) and the major functions of the vestibular organs.