"Travel sickness" refers to a feeling of nausea or discomfort that some people experience while traveling in a vehicle, such as a car, boat, or plane. It can make you feel sick, dizzy, or even vomit due to the motion of the vehicle. Full definition
This also means avoiding contact with other people suffering from travel sickness as hearing them talk about it can make it worse. (mumstheword.me)
You should know that these signs are not always a manifestation of travel sickness; often, a child can experience only uncomfortable sensations. (bebezclub.com)
I actually had pretty bad travel sickness as a kid. (skepticalob.com)