How did I get MdDS? I never went on a cruise. 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 known causal event, i.e.: lack a motion trigger. A connection between spontaneous onset and migraine, stress, or other non-motion event has been suggested but further research is required to make any correlations.

Suggested Reading

Cha YHMal de DebarquementSemin Neurol29:520-7, 2009. Review.