text: The inner ear is particularly important in the maintenance of balance and equilibrium because it contains sensors for both angular (rotational) and linear motion. Airsickness is usually a combination of spatial disorientation, nausea and vomiting.
  Signs and symptoms
  Common symptoms of airsickness include:
  Nausea, vomiting, vertigo, loss of appetite, cold sweating, skin pallor, difficulty concentrating, confusion, drowsiness, headache, and increased fatigue.
  Severe airsickness may cause a person to become completely incapacitated.
  Risk factors
  The following factors increase some people's susceptibility to airsickness:
  Fatigue, stress and anxiety are some factors that can increase susceptibility to motion sickness of any type.
  The use of alcohol, drugs, and medications may also contribute to airsickness.
  Additionally, airsickness is more common in women (especially during menstruation or pregnancy), young children, and individuals prone to other types of motion sickness.
  Although airsickness is uncommon among experienced pilots, it does occur with some frequency in student pilots.
  Prevention
  Travelers who are susceptible to motion sickness can minimize symptoms by:
  Choosing a window seat with a view of the Earth's surface or of lower clouds, such that motion can be detected and visually observed.
  Choosing seats with the smoothest ride in regards to pitch (the seats over the wings in an airplane). This may not be sufficient for sensitive individuals who need to see ground movement.