Disease Overview Mal de debarquement (MDD) is a rare and poorly understood disorder of the vestibular system that results in a phantom perception of self- motion typically described as rocking, bobbing or swaying.

"Bad disembarkment syndrome," medically known as Mal de Débarquement Syndrome (MdDS), is a rare neurological condition where a person feels a persistent sensation of rocking, swaying, or bobbing after being on a moving vessel, such as a cruise ship, airplane, or even a long car ride. Unlike standard "sea legs," which usually disappear within a few hours or days of returning to solid ground, MdDS persists for months or even years. Curiously, the phantom motion often disappears temporarily when the person is back in a moving vehicle. The exact cause is not fully understood, but it is believed to be a failure of the brain to "re-adapt" to a stable environment after it has adjusted to the rhythmic motion of travel. It most commonly affects middle-aged women and can be incredibly debilitating, often accompanied by "brain fog," anxiety, and extreme fatigue. Treatment is specialized and may include vestibular rehabilitation therapy or "readaptation of the vestibulo-ocular reflex" (VOR) using moving visual stimuli to help the brain realize that the body is no longer on the water.