Narcissist's Problem is a term used to describe the psychological condition of extreme self-centeredness and vanity. Egomania, EGOISM, and EGO are all related terms that are used to describe this condition. Egomania is an excessive or exaggerated sense of self-importance, EGOISM is the belief that one's own interests are more important than those of others, and EGO is the part of the mind that mediates between the conscious and unconscious.