Pervasive
The pattern appears across many personal and social situations rather than in one isolated context.
DSM-5-TR · personality · differential diagnosis
A personality disorder is not simply a personality trait. In DSM-5-TR, it is an enduring, inflexible and pervasive pattern of thinking, feeling or behaving that causes significant distress or impairment.
DSM-5-TR describes 10 specific personality disorders, traditionally organised into Clusters A, B and C. The clusters are useful for presentation, but they do not replace individual clinical assessment.
General DSM-5-TR requirements
Diagnosis requires an enduring pattern that deviates markedly from cultural expectations in at least two domains: cognition, affectivity, interpersonal functioning or impulse control.
The pattern appears across many personal and social situations rather than in one isolated context.
It is long-standing and can be traced back at least to adolescence or early adulthood.
It causes significant distress or impairment in social, occupational or other important areas.
The pattern is not better explained by another mental disorder, a substance/medication effect or a medical condition.
Cluster A
Cluster B
Cluster C
An important clarification
DSM-5-TR’s main categorical system contains ten specific personality disorders. Personality change due to another medical condition is a separate diagnosis related to the physiological effects of a medical condition; it is not an eleventh specific personality disorder.
Assessment
A checklist or a few matching traits are not enough. Diagnosis requires clinical interviewing, review of the person’s long-term pattern and its impact across settings, and differential diagnosis. Personality questionnaires and tests can support the assessment.
That is common: some traits overlap across personality disorders and can also occur in other conditions. The purpose of assessment is precisely to avoid starting from a predetermined answer.