Psychiatric symptoms are frequently encountered in Wilson's disease (WD). The recent resurgence of interest in neuropsychiatry has led to a more detailed consideration of the psychopathology associated with WD. As suggested by Wilson, disorders of affect, behavior and personality are the most common features. Contrary to Wilson's view, recent evidence suggests that such symptoms have an organic basis. Cognitive impairments tend to be mild and improve with treatment. There is a lack of recent evidence for an association between WD and organic delusional disorders.