Can I have MdDS without a motion event?

Yes. While MdDS most often presents after a motion event (typically travel), about 20% of cases do not have a motion trigger or known causal event. A connection between spontaneous onset MdDS and migraine, stress, or other non-motion event has been suggested but further research is required to make any correlations.

Suggested Reading:

Cha YH. Mal de Debarquement. Semin Neurol, 29:520-7, 2009. Review.