Mal de Débarquement Syndrome (MdDS) is a rare disorder that usually develops after travelling, especially by sea. Some people may also feel it after long auto or air travel, though it is not very common. This condition is more prevalent in women than in men and can cause distress in everyday life.
Some patients may develop MdDS even without a history of exposure to prolonged motion. The intensity of this false sense of motion varies from person to person. Symptoms are usually decreased when the patient is experiencing passive motion such as in a moving car, aeroplane etc. It often disappears completely on driving. Unfortunately, MdDS often goes undiagnosed or misdiagnosed and may continue for years if not treated properly. (more info)