Dromomania

Dromomania, also travelling fugue , is an uncontrollable psychological urge to wander. People with this condition spontaneously depart from their routine, travel long distances and take up different identities and occupations. Months may pass before they return to their former identities. The term comes from the Greek: dromos (running) and mania (insanity). In the common English vernacular this is often rendered simply as 'wanderlust' (directly from the German), although dromomania does imply a psychological compulsion, usually on one's own and often without one's conscious knowledge, rather than a more generalised desire to travel.