Neurosis[i] is a broad term for an abnormal condition of the nervous system. Originally neurosis signified disorders in the functioning of the nervous system that lack obvious physiological cause. Neurotic disorders indicate the existence of an inner injury that is rendered evident by its effects on mentality. The term neurosis is especially appropriate for psychology that deals with the invisible spiritual interior. The simplistic view of psychology to regard individuals as born equal requires that the cause of psychoneurosis is some stressful experience. Fear of castration, for instance, could be the invisible basis of neuroses.
Most generally a neurotic disorder is the inability to adapt, to change and to feel satisfied. Any physical injury damages the corresponding part of the nervous system, causes dissatisfaction, reduces adaptational ability and tends to produce neuroses. The modern definition of neurosis is wider and also includes physically induced dysfunctions of the nervous system. Thus it is normal for the amputation of a limb at an early age to seriously alter mentality and eventually to lead to the formation of a psychological complex.[ii]