From Myth to Diagnosis in Three Steps
The word made a specific, traceable path into clinical language. In 1898, the English physician and writer Havelock Ellis used 'Narcissus-like' to describe a form of intense self-focused eroticism he was observing in patients. In 1899, German psychiatrist Paul Näcke coined the more formal German term 'Narzissismus' for a related concept.
It was Sigmund Freud's 1914 essay 'On Narcissism: An Introduction' that turned the term into a foundational concept in psychoanalysis — distinguishing 'primary narcissism,' a normal stage of early childhood self-focus, from pathological narcissism in adults who never fully outgrow it. From there, the concept slowly worked its way from psychoanalytic theory into mainstream diagnostic language, culminating in Narcissistic Personality Disorder's formal inclusion in the DSM-III in 1980.

