Mental Health & ADHD Comorbidities

What Is Borderline Personality Disorder? BPD Symptoms, Treatments & Causes

Borderline personality disorder (BPD) is a Cluster B personality disorder that causes unstable relationships, emotions, and self-concept. Here, understand BPD’s symptoms, causes, link to ADHD, treatments, and more.

Black-and-white man is clasping his head with hands, suffering from unbearable headache caused by stress and overwork, head is broken down to fragments, over depressive red background
Black-and-white man is clasping his head with hands, suffering from unbearable headache caused by stress and overwork, head is broken down to fragments, over depressive red background

What Is Borderline Personality Disorder?

Borderline personality disorder (BPD) is characterized by instability in self-image, relationships, and emotions.

BPD is estimated to be the third most prevalent personality disorder, affecting about 1.6% of the global population1. Up to 20% of inpatient psychiatric patients have BPD, suggesting that people with BPD are more likely to require intensive mental health care2.

BPD is one of 10 personality disorders listed in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5). Along with histrionic, antisocial, and narcissistic personality disorders, BPD is a Cluster B disorder, which causes affected individuals to appear erratic, emotional, or dramatic.

BPD Symptoms

Though symptoms may manifest in different ways, people with BPD experience at least five of the following:

  • Efforts to avoid abandonment. People with BPD fear losing relationships, and they may make seemingly excessive attempts to keep people close.
  • Unstable and intense relationships. People with BPD may become quickly infatuated with someone only to devalue them after a (real or perceived) slight.
  • Unstable self-image. People with BPD struggle to sustain a sense of self.
  • Impulsivity. In at least two areas, such as driving or substance use, people with BPD act in ways that are potentially self-damaging.
  • Suicidality or self-harm. People with BPD may display suicidal behavior, gestures, or threats. They may also self-harm. The risk for suicide among people with BPD is 40 times higher than it is among the general population.
  • Reactive mood. BPD causes unstable emotions, leading sufferers to intense, usually brief, emotional episodes in responses incongruent with their situations.
  • Chronic feelings of emptiness.
  • Inappropriate anger. People with BPD may experience disproportionate anger, leading to difficulty controlling their temper.
  • Stress-related symptoms. Stress can cause people with BPD to experience paranoid ideation or severe dissociative symptoms3.

[Self-Test: Borderline Personality Disorder]

Other Signs of BPD

Though symptoms are used to diagnose BPD, the following associated features may help clinicians support a diagnosis. These can include:

  • Self-sabotage, especially just before the completion of a goal.
  • Psychotic symptoms, such as hallucinations, in times of stress.
  • A history of abuse, especially childhood abuse.
  • Reliance on pets and inanimate objects due to unstable relationships with people.
  • Increased risk for depression4.

Causes of BPD

While research is still ongoing into causes of BPD, there are factors that have been correlated with an increased risk, including:

  • Genetics. BPD runs in families, indicating that there is a likely genetic link. However, no specific genes have been identified as playing a role in BPD.
  • Abuse. Especially in childhood, abuse may increase an individual’s chance of developing BPD. Sexual abuse, physical abuse, emotional abuse (particularly invalidating environments) and neglect are all risk factors for BPD.
  • Brain differences. People with BPD experience a disconnect between the brain centers that control emotion and behavior, causing some of their symptoms.


ADHD commonly co-occurs with BPD, with 10% to 27% of people with ADHD meeting criteria for a BPD diagnosis5. Studies suggest that BPD is less common in people with inattentive ADHD. At the same time, people with ADHD, especially women, are sometimes misdiagnosed with BPD.

ADHD and BPD have similar symptoms, such as emotional dysregulation and impulsivity, making it difficult to differentiate the two conditions. However, stress-related psychotic symptoms and feelings of emptiness are unique to BPD, while hyperfocus and attention difficulties point primarily to ADHD.

New research suggests there may be a link between childhood ADHD and the development of BPD later in life. Severity of pediatric ADHD symptoms is correlated with severity of BPD symptoms in adulthood, according to a 2022 study from Scandinavia that found childhood impulsivity to be the strongest predictor of BPD6. The underlying reason for the link is unknown, though research is ongoing.

[Download: 9 Conditions Often Linked to ADHD]

Treating BPD

Though once considered untreatable, BPD now has a range of effective treatments. Dialectical behavior therapy (DBT), a type of cognitive behavioral therapy (CBT), was initially developed in the 1980s by Seattle psychologist Marsha Linehan, Ph.D., specifically to treat BPD. A study published in Borderline Personality Disorder and Emotional Dysregulation found that three-quarters of patients no longer met the symptom criteria for BPD after undergoing DBT treatment7.

In addition to DBT, mentalization-based treatment (MBT), schema-focused therapy (SFT), transference focused therapy (TFP), and systems training for emotional predictability and problem solving (STEPPS) have been established as evidence-based treatments for BPD8.

In addition to psychotherapy, medication may be prescribed to treat specific symptoms. Antipsychotic medications, mood stabilizers, and antidepressants are commonly used in people with BPD, though there is doubt about the effectiveness of antidepressants outside of major depressive episodes9.

Borderline Personality Disorder: Next Steps

View Article Sources

1Sansone, R. A., & Sansone, L. A. (2011). Personality disorders: a nation-based perspective on prevalence. Innovations in clinical neuroscience, 8(4), 13–18.
2Chapman J, Jamil RT, Fleisher C. Borderline Personality Disorder. StatPearls.
3American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). 663
4American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). , 665
5Matthies, S. D., & Philipsen, A. (2014). Common ground in Attention Deficit Hyperactivity Disorder (ADHD) and Borderline Personality Disorder (BPD)-review of recent findings. Borderline personality disorder and emotion dysregulation, 1, 3.
6Tiger, A, Ohlis, A, Bjureberg, J, et al. Childhood symptoms of attention-deficit/hyperactivity disorder and borderline personality disorder. Acta Psychiatr Scand. 2022; 1- 11.
7Stiglmayr, C., Stecher-Mohr, J., Wagner, T. et al. Effectiveness of dialectic behavioral therapy in routine outpatient care: the Berlin Borderline Study. Borderline Personality Disorder and Emotional Dysregulation, 1, 20 (2014).
8Choi-Kain, L. W., Finch, E. F., Masland, S. R., Jenkins, J. A., & Unruh, B. T. (2017). What Works in the Treatment of Borderline Personality Disorder. Current behavioral neuroscience reports, 4(1), 21–30.
9Olabi, B., & Hall, J. (2010). Borderline personality disorder: current drug treatments and future prospects. Therapeutic advances in chronic disease, 1(2), 59–66.