What is "motion sickness" or "sea sickness"?

What is "motion sickness" or "sea sickness"?

Jason Hamilton (Facial Plastic & Reconstructive Surgeon) gives expert video advice on: What is "motion sickness" or "sea sickness"?; What can I do to prevent or treat motion sickness?; How can I reduce or prevent dizziness? and more...

Motion sickness is caused by misinterpretation of the signals between the eye and the ear. When you are, for example, on a ship, you perceive your environment to be fixed, because you're on a large ship, but your ear senses that you're in constant motion. That kind of discontinuity between your visual cue and the balance system in the ear causes you to feel a sick sensation, or motion sickness.