The term 'Neurosis' was first introduced in 1769 by William Cullen (1710- 1790). Till later part of nineteenth century, anxiety disorders were conspicuously missing from the classification of psychiatric disorder. Mayer (1 886-1950) included in his nomenclature a separate description of neurosis, psychoses, affective states, organic braindisease and sub normality.
Sigmud Freud (1841- 1925) developed a classification of neuroses; and his concepts of neuroses have formed the foundation of psychoanalytical thought.
Neurosis may be defined as a mild to moderately severe illness in the personality in which the ego function of reality-testing is greatly impaired, and in which the maladjustment to life is relatively limited. (Bimla Kapoor 2001) In this unit you will read about different types of somatoform disorder, post traumatic disorder and psychophysiological disorder in specific to the classificatidn under ICD- 10.