Just as police and judges can define certain people as criminal, so can health care professionals define who is "sick." this power is described by

For the answer to the question above, this labeling theory. 
labeling theory is the view of deviance according to which being labeled as a "deviant" leads a person to engage in deviant behavior. Originating in Howard Becker's work in the 1960s, labeling theory explains why people's behavior clashes with social norms.

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