Motion sickness is a discomfort produced by stimulation of the labyrinth in the inner ear, and is affected by a combination of personal constitution, sleep, diet, inner ear diseases, and odors. When the human body is traveling in cars, boats, airplanes and all objects with variable-speed motion, our inner ear labyrinth can not adapt well to the variable-speed motion, which makes the corresponding sympathetic nerves produce excitement, resulting in human discomfort symptoms. Motion sickness is characterized by dizziness, nausea, vomiting, abdominal distension, pallor, cold sweat, etc. Usually the symptoms can be relieved after stopping the ride. There are significant individual differences in motion sickness. When the incoming balance stimulus is too strong, even in the balance system of the normal population, will feel dizzy, this is a normal physiological phenomenon, a moment can disappear. However, some people have a special constitution and this tolerance is poor, producing a strong reaction to a slight balance stimulus. In addition to the body, poor sleep, too hungry and too full, suffering from certain ear diseases, the taste of certain gasoline can be induced by aggravation of motion sickness. People who suffer from motion sickness can preventively take drugs such as Benadryl orally before traveling by car, and the drugs should be used in accordance with medical advice.