Joy, 36, has been living with a chronic sensation of seasickness for more than seven months. Her symptoms presented suddenly, after a half-hour ski boat outing. She was diagnosed with Mal de Débarquement Syndrome (MdDS), or Disembarkment Syndrome, a rare disorder that most often develops after an ocean cruise, and sometimes following prolonged air or auto travel. MdDS is characterized by a persistent sensation of motion that is often accompanied by fatigue, imbalance and difficulty concentrating. Neurologist Dr. Yoon-Hee Cha joins The Doctors via video to explain the suspected risk factors for MdDS and how the disorder is treated.