The BPD diagnostic criteria, as summarised from the DSM IV (Diagnostic and Statistics Manual of Mental Disorders 4th Edition as used by the American Psychiatric Association):
"A person who suffers from this disorder has labile interpersonal relationships characterized by instability. This pattern of interacting with others has persisted for years and is usually closely related to the person's self-image and early social interactions. The pattern is present in a variety of settings (e.g., not just at work or home) and often is accompanied by a similar lability (fluctuating back and forth, sometimes in a quick manner) in a person's affect [mood], or feelings. Relationships and the person's affect may often be characterized as being shallow. A person with this disorder may also exhibit impulsive behaviours and exhibit a majority of the following symptoms:
* frantic efforts to avoid real or imagined abandonment.
* a pattern of unstable and intense interpersonal relationships characterized by alternating between extremes of idealization and devaluation
* identity disturbance: markedly and persistently unstable self-image or sense of self
* impulsivity in at least two areas that are potentially self-damaging (e.g., spending, sex, substance abuse, reckless driving, binge eating)
* recurrent suicidal behaviour, gestures, or threats, or self-mutilating behaviour
* affective instability due to a marked reactivity of mood (e.g., intense episodic dysphoria, irritability, or anxiety usually lasting a few hours and only rarely more than a few days)
* chronic feelings of emptiness
* inappropriate, intense anger or difficulty controlling anger (e.g., frequent displays of temper, constant anger, recurrent physical fights)
* transient, stress-related paranoid ideation or severe dissociative symptoms"
Anyone with 5 or more of the above traits may be diagnosed with BPD. However, the traits must be long-standing (pervasive) and there must be no better explanation for them (for example a physical illness, another mental illness or substance misuse
sorry to be so slow with the definition