A TEACHER has been suspended after being diagnosed as a pathological liar who had been leading a fantasy life.

The Brisbane man, who can't be named for legal reasons, taught at various public and private schools before being diagnosed with "pseudologia fantastica" - an uncommon but long-lasting condition often described as pathological or compulsive lying.

The Queensland College of Teachers suspended his registration last month after a psychiatrist's report.

The assessment, filed in the Queensland Civil and Administrative Tribunal, reveals the sidelined teacher's "unusual behaviour" included telling others of his fictitious involvement in high-level jobs and of top job offers that did not exist, relationships with people later found to be made-up, and links to events that never happened.

The report said it was "potentially dangerous for him to be in a teaching position".