Many people start feeling sick whenever they have to travel. This feeling is referred to as motion sickness.
Motion sickness occurs when repetitive small movements mean the brain is sent mixed messages.
The eyes say one thing about the position of the body, whilst the delicate inner ear balance mechanisms are reporting something different. This confusion usually results in feelings of nausea, sometimes vomiting and coming over all sweaty. It's not always motion, however, that sets people off. If the sufferer is old enough then they should sit in the front of the car where they can get a clear view of the road. Young children should be positioned in the back seat again where a clear view of the road is available to them.