Children’s motion sickness is usually caused by their own factors, external factors, genetic factors, such as poor balance system function, overfeeding, bumps on the road, etc., the specific analysis is as follows: 1. Self-factors: some children are born with a low threshold of balance system stimulation, when the vehicle is moving forward, the visual and vestibular sense is not coordinated, it is easy to be stimulated and motion sickness occurs. 2. External factors: such as eating too much before the car caused by stomach bloating, the vehicle is easy to cause nausea and vomiting symptoms. If the vehicle is traveling forward when the road is not good to produce bumps, the parasympathetic nervous system is slightly stimulated, easy to trigger motion sickness, vomiting. If the child is sensitive to smell, smell the gasoline will be dizzy, want to vomit, the symptoms of motion sickness. 3. Genetic factors: parents or family history of very serious cases of motion sickness, the proportion of children with motion sickness is relatively high. There may be other causes of motion sickness in children, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.