injuries poisoning
Motion Sickness
Introduction
Motion sickness is a symptom complex that usually includes nausea, often accompanied by vague abdominal discomfort, vomiting, dizziness, pallor, diaphoresis, and related symptoms. It is induced by specific forms of motion, particularly repetitive angular and linear acceleration and deceleration, or as a result of conflicting vestibular, visual, and proprioceptive inputs. Behavioral change and drug therapy can help prevent or control symptoms. Motion sickness is a normal physiologic response to a provocative stimulus. Its overall incidence ranges from<1% on airplanes to nearly 100% on ships in rough seas and upon becoming weightless during space travel. Individual susceptibility to motion sickness varies greatly. It does, however, occur more frequently in women and in children between the ages of 2 and 12 years, though it is rare in infants < 2 years. Symptoms of motion sickness sometimes diminish as patients get older, and new-onset motion sickness is uncommon after the age of 50. 