Borderline Personality Disorder (BPD) is defined as a personality disorder primarily characterized by emotional dysregulation, extreme "black and white" thinking, or "splitting", and chaotic relationships. The general profile of the disorder also typically includes a pervasive instability in mood, interpersonal relationships, self-image, identity, and behavior, as well as a disturbance in the individual's sense of self. In extreme cases, this disturbance in the sense of self can lead to periods of dissociation.
The disturbances suffered by those with borderline personality disorder have a wide-ranging and pervasive negative impact on many or all of the psychosocial facets of life, including ability to hold down a job and relationships in work, home, and social settings. Comorbidity is common; borderline personality disorder frequently occurring with substance use disorders and mood disorders. Attempted suicide and completed suicide are possible outcomes without proper care and effective therapy.