Borderline personality disorder (BPD) is one of four Cluster B personality disorders in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition—the others being antisocial personality disorder, histrionic personality disorder, and narcissistic personality disorder. The term borderline was first introduced in 1938 to describe patients not easily classified as psychotic or neurotic. BPD affects 1–2% of the general population and is the most common personality disorder in clinical settings, present in up to 10% of psychiatric outpatients and 20% of psychiatric inpatients. The condition is also overrepresented in prison samples, with estimates ranging between 25% and 50%. Given the seriousness of this condition, in 2008, the U.S. House of Representatives unanimously passed a resolution calling May the BPD Awareness Month. This entry reviews ...

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