By the end of the afternoon, at least two-thirds of us were suffering from motion sickness. About one in three people are considered highly prone to motion sickness, though some people undoubtedly have it worse than others. In fact, some studies show that up to 70 percent of the variation in motion sickness susceptibility is inherited. The chances of dealing with motion sickness increases again in our later years, due to the fact that the inner ears’ motion sensors degenerate with age. People prone to high anxiety or migraines can also be at a higher risk for motion sickness.