Distinguishing Histrionic from Borderline Personality Disorder

Core Distinguishing Features

Borderline personality disorder (BPD) is characterized by intense inner pain, unstable self-concept, repeated self-injury and suicidality, and chaotic interpersonal relationships, whereas histrionic personality disorder (HPD) centers on attention-seeking behavior and excessive emotionality without self-destructive behaviors or suicidality, according to the American Psychiatric Association 1.
Suicidality and self-harm are hallmark features of BPD, with 11-44% of young people with BPD having attempted suicide, as reported by the Journal of Child Psychology and Psychiatry and Allied Disciplines 2.
BPD involves a varying and unstable self-concept that shifts dramatically, which is not characteristic of HPD, as noted by the American Psychiatric Association 1.
Dissociative symptoms, including derealization and depersonalization, are experienced by BPD patients and may be mistaken for psychotic symptoms, according to the American Psychiatric Association 3.

BPD relationships are chaotic and unstable, marked by intense fear of abandonment, alternating idealization and devaluation, and genuine difficulty maintaining stable connections, as reported by the American Psychiatric Association 1, 3.

The presence of suicidality and self-harm points definitively toward BPD, not HPD, as stated by the American Psychiatric Association 1.
BPD's dissociative symptoms should not be mistaken for primary psychotic disorder, as BPD lacks formal thought disorder, disorganized thought, and disorganized speech characteristic of schizophrenia, according to the American Psychiatric Association 3.
Identity disturbance is a key differentiator between BPD and HPD, with BPD patients exhibiting a varying self-concept, as noted by the American Psychiatric Association 1.

Accurate differentiation between BPD and HPD requires gathering information from multiple sources using varied developmentally sensitive techniques, as self-reporting may be unreliable, as reported by the American Psychiatric Association 1.
Confirmation from multiple informants is necessary due to potential discrepancies, according to the American Psychiatric Association 1.
Specific inquiry about suicide attempts, self-injury, identity confusion, and dissociative experiences is necessary to identify BPD, as stated by the American Psychiatric Association 1, 3.
Longitudinal assessment is necessary to observe the temporal stability of symptoms and relationship patterns, as reported by the American Psychiatric Association 3.

Idealization and devaluation are unstable interpersonal relationship patterns in borderline personality disorder (BPD) where patients rapidly alternate between viewing others as entirely "Good" (idealization) or entirely "Bad" (devaluation), rather than maintaining balanced, nuanced perceptions of people over time, according to the American Academy of Child and Adolescent Psychiatry 4
These unstable interpersonal relationships alternate between idealization and denigration, representing a core DSM criterion for BPD diagnosis, as stated by the American Academy of Child and Adolescent Psychiatry 4
Varying concepts of self oscillate between grandiosity and worthlessness, paralleling the external relationship instability, as noted by the American Academy of Child and Adolescent Psychiatry 4