Motion sickness occurs when one part of the balance-sensing system (inner ear, joints and muscles, or vision) may indicate that the body is moving, while the other parts do not sense motion. For example, when a person is in the cabin of a moving ship, the inner ear may sense the motion of big waves, but the eyes don't see any movement. This leads to a conflict between the senses and results in motion sickness.
Last Revised: March 24, 2011
Author: Healthwise Staff
Medical Review: Anne C. Poinier, MD - Internal Medicine & Brian D. O'Brien, MD - Internal Medicine
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