The tradition of diagnosing a patient's illness or disease stems from medical practice. The word diagnosis in fact means to classify symptoms with the aim of describing a set of symptoms that the client or patient exhibits. The purposes of diagnosis are to (a) simplify and reduce the complexity of a clinical phenomenon, (b) facilitate communication between clinicians, (c) anticipate outcomes, (d) decide on appropriate treatment for the client, and (e) search for and better understand the etiology of the disorder from which the client suffers.

Diagnostic Systems

There are two diagnostic systems used in different parts of the world to describe mental disorders, including substance use disorders: (1) the International Classification of Diseases, now in its 10th edition, developed by the World Health Organization, and (2) ...

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