PATHOPHYSIOLOGY: Due to abnormal or asymmetric stimulation

A.    Vertigo:  sensation of whirling in space

B.    Deficiencies of posture and balance

C.    Motion Sickness

1. Associated with prolonged stimulation of utricle-saccule or semicircular canals; effects can sum if both are stimulated; "discordant" sensory input may contribute, also

2. Signs and symptoms

nausea (sometimes with vomiting)
sweating
vertigo
headache

D.    Meniere’s Disease: vertigo, hearing impairment, often tinnitus (may be due to rupture of the membrane separating endolymph from perilymph) or impeded drainage of endolymph