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Stigma is one of the biggest real-world barriers to people getting help for mental illness, which is exactly why psychiatry treats it as a formal topic rather than a vague background feeling. Erving Goffman (the sociologist who also wrote about total institutions) gave the field its foundational definition of stigma in his 1963 work on the subject: stigma is a discrediting attribute, meaning a trait that reduces a person, in the eyes of others, from a whole and ordinary person to a tainted, discounted one.

Crucially, a stigmatising trait is not inherently shameful in itself; it becomes discrediting only because of the social meaning a given community attaches to it. For example, imagine two societies where one treats a psychiatric diagnosis as a private medical matter deserving support, while the other treats the same diagnosis as evidence of dangerousness or moral weakness; the trait is identical, but only the second society's response counts as stigma in Goffman's sense. This is why stigma is best understood as a social process, not a fixed property of the person carrying the trait.

The caveat that trips up beginners is treating "stigma" as one single phenomenon. It is not: a core exam skill for this topic is correctly naming which level of stigma a given scenario describes, because stigma operates at several distinct, separately-defined levels that call for entirely different responses.

Labelling theory (most closely associated with the sociologist Thomas Scheff) offers one influential explanation for how stigma becomes durable rather than transient. The theory proposes that once a person is formally labelled with a diagnosis, other people begin responding to that person primarily through the lens of the label, rather than as a full, complex individual; this altered treatment can, in turn, push the labelled person into playing out the very role the label implies, in a kind of self-fulfilling pattern. For example, imagine a young man labelled early in life with a psychiatric diagnosis, after which teachers, employers, and even family start relating to him mainly as "the diagnosed one" rather than as a whole person; over time, this narrowed treatment can itself shape how he sees and presents himself, reinforcing the label's grip. Labelling theory does not claim the underlying condition is imaginary, but it highlights how the social reaction to a diagnosis can become a second, compounding problem layered on top of the original condition.

Public stigma (also called enacted stigma) is the general public's negative attitudes and resulting discriminatory behaviour directed at a stigmatised group from the outside; consider a landlord who refuses to rent a flat to someone once they disclose a history of psychiatric admission, purely because of that disclosure. Self-stigma (also called internalised stigma) is a different, more inward-facing process: it happens when a person who belongs to the stigmatised group absorbs society's negative beliefs about that group and applies them to themselves, which can damage their self-esteem and make them less likely to seek help. For example, imagine a patient with depression who avoids seeing their general practitioner not because anyone has treated them badly, but because they have privately come to believe that needing help for depression makes them weak. Structural stigma sits at a still different level: it is stigma embedded in the policies, laws, and institutional practices of a society, rather than in any one person's individual attitude. A national insurance scheme that systematically offers worse coverage for psychiatric conditions than for physical conditions is structural stigma, because the discrimination is written into the system itself. Courtesy stigma (also called associative stigma) extends the discrediting effect outward from the stigmatised person to the people connected to them, such as family members or professional carers.

The four levels of stigma are themselves the main differential exercise in this topic, and mixing them up is the single most common error. The discriminator is always "who is doing the discriminating, and where does it live?": an outside person discriminating against the labelled individual is public stigma; the labelled individual discriminating against themselves is self-stigma; a policy or system embedding the discrimination is structural stigma; and discrimination spreading to a bystander connected to the labelled person is courtesy stigma. It is also worth distinguishing stigma itself from the related but narrower idea of discrimination: stigma is the underlying discrediting social attitude, while discrimination is the unfair behaviour that can follow from it; you can hold a stigmatising belief without ever acting on it, though public stigma, by definition, includes the behavioural, discriminatory part.

Stigma is not diagnosed in an individual patient the way a disorder is, but it is measured, both in research and in clinical practice, using structured, validated instruments rather than informal impressions. Public attitudes are commonly assessed with standardised attitude questionnaires that ask members of the public to rate agreement with statements about dangerousness, blame, or social distance toward people with mental illness. Self-stigma specifically is commonly assessed with structured self-report tools such as the Internalized Stigma of Mental Illness scale, which asks the person themselves to rate how much they have absorbed and applied negative stereotypes to themselves. In clinical practice, self-stigma is often identified more informally, by directly asking a patient how they feel about having their diagnosis and listening for shame, self-blame, or reluctance to disclose it to others, since this can be a hidden barrier to engagement that is easy to miss if not specifically asked about.

A large body of evidence in this field compares different anti-stigma intervention strategies, and the finding relevant here is reasonably consistent: contact-based interventions, meaning structured opportunities for the general public to have direct, personal interaction with people who have lived experience of a mental health condition, reduce stigma more reliably than education-only approaches, meaning interventions that simply present facts and statistics about mental illness without any direct human contact. Education alone can shift what people say they believe, but it is comparatively weak at shifting how people actually behave toward a stigmatised group. The practical, exam-relevant lesson is that an anti-stigma intervention aimed at the wrong level of stigma is unlikely to work well: a population-level, contact-based public awareness campaign is well suited to reducing public stigma, but it will do very little for a patient whose main barrier is self-stigma, which usually needs individual therapeutic work rebuilding self-esteem and challenging internalised negative beliefs, while structural stigma requires policy and legislative change rather than either individual approach. Source-wise, this page is grounded in Goffman's stigma framework, Link and Phelan's social-process account, and WHO-aligned public-mental-health evidence on anti-stigma programmes; it is not a NICE diagnostic or disorder-treatment guideline.

Recognising which level, public, self, structural, or courtesy, a given scenario is describing is not a pedantic distinction; it is the single skill that determines whether a proposed intervention will actually address the barrier described. The classic trap is a vignette describing a patient who avoids treatment purely out of internal shame, with no external party actually having discriminated against them; a fast reader mislabels this public stigma, when it is precisely self-stigma, because the discrimination described is happening entirely inside the patient's own beliefs about themselves.

Stigma is Goffman's discrediting attribute, but it operates at four distinct levels: public (outward discrimination), self (internalised), structural (embedded in policy), and courtesy (spreading to associates), and matching a scenario to the right level is what determines whether the right anti-stigma intervention, most reliably a contact-based one, actually addresses it.