Once a catch-all for nervous disorders, neurosis is now a relic of medical history.
In short: Coined in 1769 to describe mysterious physical ailments, the term neurosis once dominated psychiatry. It evolved from a physiological diagnosis into a Freudian framework for repressed trauma, before being entirely purged from modern diagnostic manuals. Today, the concept survives only as a personality trait or a historical curiosity.
The term neurosis was introduced by Scottish physician William Cullen in 1769 to categorize disorders of sense and motion that lacked clear physiological causes. For over a century, it served as a broad umbrella for conditions ranging from epilepsy and migraine to hysteria. By the late 19th century, figures like Jean-Martin Charcot and Pierre Janet began shifting the focus toward psychological trauma, with Janet emphasizing dissociation as a core mechanism. Sigmund Freud later redefined neurosis as a consequence of the brain's defense against repressed past experiences, cementing its place in psychoanalytic theory.
Throughout the 19th and early 20th centuries, treatments for neurosis were often as varied as the symptoms themselves. Patients were subjected to everything from morphine and bromides to the intensive rest cures popularized by Weir Mitchell, which involved isolation, fattening diets, and electrical stimulation. Later, the field saw the rise of rational psychotherapy—a precursor to cognitive behavioral therapy—and progressive muscle relaxation, developed by Edmund Jacobson in 1908 to help patients recognize and reduce physical tension.
The concept eventually faced a crisis of definition. During World War I, the term battle neurosis was used to describe combat-related psychological distress, but by the late 20th century, the medical establishment moved toward more specific diagnostic categories. Today, the term has been removed from the World Health Organization's ICD and the American Psychiatric Association's DSM. While the related term neuroticism persists as one of the Big Five personality traits, the original clinical category of neurosis has been abandoned in favor of more precise, evidence-based classifications of mental health.
Beyond clinical psychiatry, experimental psychology in the early 20th century explored neurosis through animal models, notably Pavlov's work on dogs subjected to irresolvable conflict. These studies treated behavior as a complex, autonomous system rather than mere mechanistic output. However, by mid-century, this holistic view was largely displaced by reductionist approaches that prioritized physiological endpoints, a shift that continues to influence contemporary debates in neuroscience regarding the best way to study and understand psychopathology.
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Sources
- Summary by Intellect · source: Neurosis
- Also: The ontological status of behaviour: lessons from experimental neurosis (1900-1950).
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