Image from Frontiers in Neurology Mal de débarquement is a relatively rare balance disorder that occurs usually after traveling at sea. While on the boat, symptoms are absent, but once on land, there is a persistent swaying, rocking, and/or bobbing motion that is felt internally for months and even years. Physical findings of mal de debarquement include body oscillations at 0.2 Hz, oscillating vertical nystagmus when the head was rolled from side-to-side, and unilateral rotation during t…