Motion sickness is a common problem in people traveling by car, train, airplanes and especially boats. This is due to visually perceived (what you see) movement and the vestibular system's (what your body) sense of movement. If motion is not resolved, the person will frequently vomit, and unlike most illnesses, vomiting does not relieve the nausea in motion sickness. There are a variety of over the counter aids with anecdotal evidence.