Understanding Borderline Personality Disorder

By David Hennessy, Clinical Psychologist, Varsity Lakes, Gold Coast, QLD

Borderline Personality Disorder (BPD) is a complex mental health condition involving persistent difficulties with emotional regulation, relationships, self-image, and behavioural control [1,2].

People living with Borderline Personality Disorder often experience emotions more intensely than many others. Emotional reactions may occur quickly, feel overwhelming, and take longer to settle. These experiences can contribute to difficulties in relationships, decision-making, self-confidence, and coping during periods of stress [2,3].

Importantly, Borderline Personality Disorder is not a character flaw, a lack of willpower, or a sign that someone is intentionally creating problems. Modern psychological research increasingly recognises BPD as a condition involving emotional vulnerability interacting with life experiences, attachment patterns, temperament, and environmental factors [3–5].

Although the condition can be associated with significant distress, research consistently demonstrates that meaningful improvement and recovery are possible [6].

What Is Borderline Personality Disorder?

According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR), Borderline Personality Disorder is characterised by a pervasive pattern of instability involving emotions, relationships, self-image, and behaviour [1].

The diagnosis typically involves difficulties across several areas including:

• Emotional regulation

• Interpersonal relationships

• Sense of identity

• Impulse control

• Fear of abandonment

Not every person experiences Borderline Personality Disorder in the same way. Individuals may present with different combinations of symptoms, strengths, challenges, and coping strategies.

Common Features of Borderline Personality Disorder

Emotional Dysregulation

One of the central features of Borderline Personality Disorder is difficulty regulating emotions [2].

People may experience:

• Intense sadness

• Anger

• Anxiety

• Shame

• Loneliness

• Emotional pain following perceived rejection

The emotion itself is not the problem. Rather, the difficulty often lies in how intensely the emotion is experienced and how difficult it can be to return to emotional equilibrium afterwards.

Fear of Abandonment

Many people with BPD experience heightened sensitivity to signs of rejection, separation, criticism, or abandonment [1,3].

Events that others may view as relatively minor can feel deeply significant. Delayed messages, cancelled plans, perceived distancing, or misunderstandings may trigger substantial emotional distress.

Relationship Difficulties

Relationships often become a major area of distress.

Many individuals report:

• Strong desires for closeness

• Intense fears of losing important relationships

• Difficulty trusting relationship security

• Cycles of conflict and repair

• Sensitivity to perceived rejection

These difficulties are usually not caused by a lack of caring. In fact, many individuals with BPD care deeply about their relationships and experience significant distress when relationships become strained.

Identity Disturbance

Some individuals describe uncertainty about:

• Who they are

• What they value

• Their goals

• Their role in relationships

• Their future direction

This may contribute to feelings of instability or confusion, particularly during times of stress or major life change [1].

Impulsivity

Impulsive behaviour may occur during periods of intense emotional distress.

Examples may include:

• Risk-taking behaviour

• Reckless spending

• Substance misuse

• Unsafe sexual behaviour

• Angry outbursts

• Sudden relationship decisions

Impulsivity is often best understood as an attempt to reduce overwhelming emotional pain in the short term, even when it creates longer-term difficulties.

What Causes Borderline Personality Disorder?

There is no single cause of Borderline Personality Disorder.

Current evidence suggests the condition develops through a combination of factors [3–5]:

Biological Factors

Research suggests some individuals may be born with heightened emotional sensitivity or emotional reactivity [4].

Developmental Experiences

Difficult childhood experiences may increase vulnerability.

Examples can include:

• Emotional invalidation

• Neglect

• Inconsistent caregiving

• Family conflict

• Trauma

• Abuse

However, not everyone with BPD has experienced severe trauma, and not everyone who experiences trauma develops BPD.

Attachment Factors

Attachment research suggests that early relationship experiences may influence how individuals understand safety, trust, closeness, and emotional support within relationships [5].

How Is Borderline Personality Disorder Diagnosed?

Diagnosis involves a comprehensive clinical assessment conducted by an appropriately qualified mental health professional.

Assessment generally includes:

• Current symptoms

• Relationship history

• Emotional functioning

• Coping patterns

• Mental health history

• Risk assessment

• Functional impacts

Diagnosis should never be based solely on internet checklists or social media content.

Treatment for Borderline Personality Disorder

Several evidence-based psychological treatments have demonstrated effectiveness.

These include:

Dialectical Behaviour Therapy (DBT)

DBT was specifically developed for individuals experiencing significant emotional dysregulation and has strong evidence supporting its effectiveness [7].

Mentalization-Based Treatment (MBT)

MBT focuses on improving the ability to understand one’s own thoughts, feelings, and motivations, as well as those of other people [8].

Schema Therapy

Schema Therapy focuses on identifying longstanding emotional and behavioural patterns that developed earlier in life and continue to influence present-day functioning [9].

Other Evidence-Based Approaches

Depending on individual needs, therapy may also incorporate:

• Cognitive Behavioural Therapy

• Acceptance and Commitment Therapy

• Mindfulness-based approaches

• Supportive psychotherapy

For further information, you may also wish to read our articles on:

• What Is Cognitive Behavioural Therapy?

• What Is Acceptance and Commitment Therapy?

• What Is Mindfulness-Based Therapy?

• DBT Wise Mind Exercise

Prognosis and Recovery

Older beliefs suggested that Borderline Personality Disorder was difficult to treat. Current evidence paints a far more hopeful picture.

Long-term research indicates that many people experience substantial improvement over time, including reductions in symptoms, improved functioning, and more stable relationships [6].

Recovery does not necessarily mean the complete absence of emotional pain. More often, recovery involves developing greater emotional flexibility, healthier relationships, improved coping skills, and a life that is increasingly guided by values rather than crisis.

Frequently Asked Questions

Is Borderline Personality Disorder Caused by Trauma?

Not always. Trauma may increase vulnerability for some people, but Borderline Personality Disorder is understood to arise through multiple interacting biological, developmental, and environmental influences [3–5].

Can Borderline Personality Disorder Improve?

Yes. Research consistently demonstrates that many individuals experience significant improvement over time, particularly when they engage in evidence-based treatment [6].

Is Borderline Personality Disorder the Same as Bipolar Disorder?

No. Bipolar Disorder primarily involves episodes of depression and elevated mood states. Borderline Personality Disorder primarily involves persistent difficulties with emotional regulation, relationships, identity, and interpersonal functioning [1].

Can Someone Have Borderline Personality Disorder and ADHD?

Yes. ADHD and Borderline Personality Disorder can co-occur, although they are separate conditions requiring careful assessment.

Does Borderline Personality Disorder Affect Relationships?

Yes. Relationship difficulties are common, particularly where fears of abandonment, emotional dysregulation, and interpersonal sensitivity are present.

References

1. American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders (5th ed., text rev.). American Psychiatric Association Publishing.

2. Gunderson, J. G., Herpertz, S. C., Skodol, A. E., Torgersen, S., & Zanarini, M. C. (2018). Borderline personality disorder. Nature Reviews Disease Primers, 4(1), 18029. https://doi.org/10.1038/nrdp.2018.29

3. Crowell, S. E., Beauchaine, T. P., & Linehan, M. M. (2009). A biosocial developmental model of borderline personality. Psychological Bulletin, 135(3), 495–510. https://doi.org/10.1037/a0015616

4. Carpenter, R. W., & Trull, T. J. (2013). Components of emotion dysregulation in borderline personality disorder. Current Psychiatry Reports, 15(1), 335. https://doi.org/10.1007/s11920-012-0335-2

5. Agrawal, H. R., Gunderson, J., Holmes, B. M., & Lyons-Ruth, K. (2004). Attachment studies with borderline patients. Harvard Review of Psychiatry, 12(2), 94–104. https://doi.org/10.1080/10673220490447218

6. Zanarini, M. C., Frankenburg, F. R., Reich, D. B., & Fitzmaurice, G. (2012). Attainment and stability of sustained symptomatic remission and recovery among patients with borderline personality disorder and Axis II comparison subjects. American Journal of Psychiatry, 169(5), 476–483. https://doi.org/10.1176/appi.ajp.2011.11101550

7. Linehan, M. M., Armstrong, H. E., Suarez, A., Allmon, D., & Heard, H. L. (1991). Cognitive-behavioral treatment of chronically parasuicidal borderline patients. Archives of General Psychiatry, 48(12), 1060–1064. https://doi.org/10.1001/archpsyc.1991.01810360024003

8. Bateman, A. W., & Fonagy, P. (2009). Randomized controlled trial of outpatient mentalization-based treatment versus structured clinical management for borderline personality disorder. American Journal of Psychiatry, 166(12), 1355–1364. https://doi.org/10.1176/appi.ajp.2009.09040539

9. Arntz, A., & van Genderen, H. (2020). Schema Therapy for Borderline Personality Disorder. Wiley.