Mental HealthICD-10: F60.3Uncommon in the general population but frequently seen in mental health services; more often diagnosed in women, though it affects all genders

Borderline Personality Disorder

Also known as: BPD, Emotionally unstable personality disorder

Borderline personality disorder (BPD) is a mental health condition characterized by intense and rapidly shifting emotions, an unstable sense of self, fear of abandonment, and turbulent relationships. People with BPD often feel emotions more intensely and for longer than others and may act impulsively, including self-harm, when overwhelmed. The condition usually becomes apparent in adolescence or early adulthood and is strongly linked to a combination of inherited emotional sensitivity and invalidating or traumatic early environments. BPD carries a great deal of stigma, yet it is highly treatable: specialized psychotherapies help most people reduce symptoms substantially, and many no longer meet the criteria for the diagnosis after several years of treatment.

At a Glance

Common symptoms
Intense fear of abandonment and frantic efforts to avoid it, real or imagined, Unstable, intense relationships that swing between idealizing and devaluing, Unclear or shifting self-image and sense of identity
Main treatments
Dialectical behavior therapy (DBT), the most studied treatment, teaching emotion regulation and distress tolerance, Mentalization-based therapy, schema therapy, or transference-focused therapy as alternatives, Medication for specific coexisting symptoms such as depression or anxiety; no drug treats BPD itself
Category
Mental Health · Uncommon in the general population but frequently seen in mental health services; more often diagnosed in women, though it affects all genders
See a doctor if
Emotions feel unmanageable and are damaging relationships, work, or study

Symptoms

Intense fear of abandonment and frantic efforts to avoid it, real or imagined
Unstable, intense relationships that swing between idealizing and devaluing
Unclear or shifting self-image and sense of identity
Impulsive, potentially self-damaging behavior (spending, substance use, risky sex, reckless driving)
Recurrent self-harm or suicidal behavior or threats
Intense mood swings lasting hours to a few days
Chronic feelings of emptiness, inappropriate intense anger, or stress-related paranoia or dissociation

Causes

  • Genetic predisposition to emotional sensitivity and impulsivity
  • Childhood trauma, abuse, or neglect
  • An invalidating environment in which emotions were dismissed or punished
  • Differences in brain regions regulating emotion and impulse control
  • Early loss or unstable family relationships

Risk Factors

  • Family history of BPD or other mental illness
  • History of childhood abuse or neglect
  • Chronic emotional invalidation growing up
  • Unstable or chaotic early family life
  • Coexisting conditions such as depression, PTSD, or substance use

Diagnosis

  • Comprehensive psychiatric assessment of long-standing patterns in emotions, relationships, and behavior
  • Structured interviews or questionnaires for personality disorders
  • Assessment of coexisting conditions including mood disorders, PTSD, ADHD, and substance use
  • Careful evaluation of self-harm and suicide risk

Treatment

  • Dialectical behavior therapy (DBT), the most studied treatment, teaching emotion regulation and distress tolerance
  • Mentalization-based therapy, schema therapy, or transference-focused therapy as alternatives
  • Medication for specific coexisting symptoms such as depression or anxiety; no drug treats BPD itself
  • Crisis planning and short hospital stays when safety is at risk
  • Treatment of coexisting conditions such as PTSD or substance use
  • Supportive: skills practice between sessions, peer support groups, and involving family in education
  • Supportive: regular sleep, exercise, and avoiding alcohol and drugs, which worsen impulsivity and mood swings

Prevention

  • Early intervention for adolescents showing emerging symptoms
  • Supportive, validating parenting and family environments
  • Treating childhood trauma and its effects promptly
  • Learning emotion-regulation skills early, before patterns become entrenched
  • Avoiding substance misuse, which intensifies symptoms

When to See a Doctor

  • Emotions feel unmanageable and are damaging relationships, work, or study
  • You are self-harming or having suicidal thoughts (seek urgent help)
  • Impulsive behavior is putting you at risk
  • You experience episodes of feeling detached from yourself or reality
  • A loved one is concerned about repeated crises or relationship turmoil

Frequently Asked Questions

Related Conditions

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