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A term generally used to describe a nonpsychotic mental illness that triggers feelings of distress and anxiety and impairs functioning.

Origins

The word neurosis means "nerve disorder," and was first coined in the late eighteenth century by William Cullen, a Scottish physician. Cullen's concept of neurosis encompassed those nervous disorders and symptoms that do not have a clear organic cause. Sigmund Freud later used the term anxiety neurosis to describe mental illness or distress with extreme anxiety as a defining feature.

There is a difference of opinion over the clinical use of the term neurosis today. It is not generally used as a diagnostic category by American psychologists and psychiatrists any longer, and was removed...