Based on your genetics and other factors, you are (less or more) likely to experience motion sickness.
Mixed signals in the easily queasy
To maintain your balance, your brain relies on signals from multiple sources: your eyes, your muscles and joints, and the vestibular system in your inner ear. Most scientists think that motion sickness occurs due to "sensory conflict" — when your vestibular system and muscles tell your brain that you're moving but your eyes send the opposite signal. Those mixed signals cause some people to feel dizzy and nauseous. And depending on genetics and other factors, some people may be more predisposed to motion sickness than others.