Motion sickness is the condition that a person starts to feel as the result of certain types of motion. In most cases, it is due to real motion, such as sitting in a moving car, train, airplane, or boat, but it can also happen as a result of a perceived sense of motion, like using a virtual reality simulator or watching an action-packed movie on a large screen. Motion sickness can start at any point that the body is in motion, with certain things making it worse, such as looking at a phone or reading a book, while the body is in motion. For some people, and in some situations, the motion sickness may only last a few minutes. In other cases, the motion sickness can last for several hours, even after the motion that caused the sickness symptoms has stopped. The duration of motion sickness will vary from one person to the next, based on how susceptible they are to experience the condition and the intensity of the motion that triggered the symptoms.