WHAT IS BPD?
What a Diagnosis Is
A diagnosis is a tool for understanding and care, not an identity. It helps clarify what a person is experiencing—as a pattern, over time—and guides decisions about support, treatment, and skill-building that can improve quality of life. A diagnosis is meant to reduce confusion, guide helpful treatment, and support growth and recovery—not to limit, define, or shame anyone.
What a Diagnosis Is Not
A diagnosis of borderline personality disorder is often misunderstood. It is essential to know that:
- It is not a label that defines who you are. A diagnosis describes patterns of experience, not a person’s worth, character, or future.
- It is not a judgment or a blame statement. BPD is not caused by weakness, bad choices, or moral failure.
- It is not based on a single moment or behavior. Diagnosis looks at long-term patterns, not at a single crisis, incident, or reaction.
- It is not a life sentence. With proper support, many people with BPD improve significantly and no longer meet diagnostic criteria later in life.
- It is not the same as being “difficult” or “dramatic.” Behaviors linked to BPD are often attempts to cope with overwhelming emotions, not attention-seeking or manipulation.
Diagnosis → suggests likely helpful treatments
Diagnosis → suggests what may be less effective
Diagnosis ≠ a single, known cause
KEY TAKEWAY
Diagnosis can be misleading and confusing. What’s important to remember is that it’s a tool to help guide effective treatment, not an identity or a definitive underlying cause. BPD has both several common co-occurring conditions, and significant diagnostic overlap with other conditions, much of which can be explained by underlying chronic emotion dysregulation. Ultimately, it’s what’s beneath the diagnosis—the patterns of feeling, thought, and behavior—that are most vital to effective treatment.
How Clinicians Use Diagnostic Criteria
Clinicians use standardized diagnostic guides—the DSM and ICD—to make diagnoses. These guides list diagnostic criteria—put more simply, possible signs of BPD—and identify what’s required to make a formal diagnosis. The DSM, for example, lists nine possible signs of BPD, and a diagnosis requires any five of these nine signs.
The diagnostic criteria of BPD are best understood as different ways chronic emotion dysregulation can show up. Ongoing difficulty managing emotions can affect:
- Feelings and mood
- Actions and impulses
- Thoughts and perceptions
- Relationships with others
- Sense of self and identity
Because only 5 of the 9 symptoms are necessary for diagnosis, there are 256 potential combinations of BPD symptoms that would still qualify for diagnosis—meaning that BPD can look very different from one individual to the next.
Mental health diagnosis differs generally from medical diagnoses. In medicine, two people with the same diagnosis often share the same underlying disease process. In mental health, two people can meet criteria for the same diagnosis despite:
- different sets of symptoms, or symptoms that present very differently
- different histories and triggers
- requiring different combinations of care
Multiple Diagnoses
You or someone you care about may have received multiple mental health diagnoses over time across different providers, settings, or stages of life, as several conditions co-occur with BPD. Receiving multiple diagnoses can feel disorienting and may raise questions: Which one is accurate? Do they conflict? Why do clinicians differ?
The presence of multiple diagnoses usually does not indicate separate or unrelated problems; rather, it reflects overlapping patterns that are often connected and reinforce one another—with the most consistent common link being severe and chronic emotion dysregulation.
This shared pattern helps explain why multiple diagnoses often appear together, and why symptoms can look different from person to person while still reflecting similar underlying difficulties. Severe and chronic emotion dysregulation includes a range of emotional and behavioral challenges that are across diagnostic categories.
By focusing on common links rather than isolated labels, it becomes easier to:
- see the whole picture
- understand why distress clusters the way it does
- choose treatment strategies that match the underlying issue
In real-world clinical settings—particularly in public and community mental health—diagnostic labels often matter less than the presenting problems. Core concerns frequently include suicidality, self-harm, and chronic emotion dysregulation, regardless of the specific diagnosis assigned.
Effective clinical care focuses on addressing patterns of distress and risk, not on treating a diagnostic label. Effective treatment targets the underlying emotional and relational difficulties that drive suffering, rather than the name used to describe them.
Why Diagnostic Overlap Happens
Mental health diagnoses are descriptive frameworks, not perfect categories. Many conditions share overlapping features, and diagnostic systems continue to evolve. This overlap can create confusion and contribute to the mistaken belief that certain diagnoses are interchangeable.
There can be overlap between BPD and other personality disorders, and in some cases a person may meet criteria for more than one diagnosis. More often, however, individuals meet criteria for one primary condition.
When comparing BPD and antisocial personality disorder specifically, overlap in diagnostic criteria is relatively limited. One practical distinction involves context and consistency:
- Many people do things they later regret when they are emotionally dysregulated.
- If problematic behaviors (such as aggression or impulsivity) occur only during periods of emotional dysregulation, this is different from the more pervasive, stable pattern expected in antisocial personality disorder.
- Behaviors that fluctuate with emotional state are often more consistent with BPD than with antisocial personality disorder, even if some criteria appear to overlap.
Understanding BPD as a distinct condition—while acknowledging overlap—supports more accurate assessment, better-matched treatment, and improved outcomes. Clarifying these distinctions is not about labeling; it is about ensuring people receive care that truly fits their needs.
Why “Cluster B” Can Be Misleading
In older diagnostic frameworks, personality disorders were grouped into clusters (Cluster A, B, and C). Cluster B includes four diagnoses: borderline, antisocial, narcissistic, and histrionic personality disorder. The term “Cluster B” is commonly used in everyday language, including by people with lived experience. The challenge is that, in practice, some of these diagnoses—particularly narcissistic and histrionic personality disorder—have low diagnostic reliability, meaning clinicians often disagree about who meets criteria. BPD and antisocial personality disorder are the two Cluster B diagnoses for which diagnostic reliability is generally stronger.
A Practical Clinical Perspective
- Patterns involving emotion dysregulation, impulsivity, self-harm, unstable relationships, and identity disturbance are more consistent with BPD than with common popular uses of other personality disorder labels.
- Diagnosis should focus on patterns over time, not isolated behaviors or moments of crisis.
How BPD Differs From Other Diagnoses
Borderline personality disorder (BPD) shares features with several other mental health conditions, particularly around emotional intensity and distress. Because of this overlap, BPD is often misunderstood or misdiagnosed. While symptoms may look similar on the surface, the overall patterns differ in important ways.
BPD and Complex PTSD
BPD and complex PTSD can appear similar, especially when emotional dysregulation, relationship difficulties, and identity disruption are present. This has led some to assume that BPD is simply a trauma-based condition.
A key distinction is that complex PTSD requires significant trauma exposure, while BPD does not. Although many people with BPD have trauma histories, trauma alone does not determine the diagnosis. In some cases, the overall pattern of chronic emotion dysregulation fits BPD more closely than complex PTSD.
Clinical takeaway: When severe, ongoing emotion dysregulation is central, treatment should directly address emotion regulation—regardless of which diagnostic label is used.
BPD and Depression
Depression is often the diagnosis people receive when hopelessness, withdrawal, or low functioning are most visible. Some individuals with depression also meet criteria for BPD, particularly when emotional dysregulation has been present for many years and multiple treatment attempts have been unsuccessful.
Clinical takeaway: When standard treatments for depression repeatedly fail, it may be helpful to consider whether chronic emotion dysregulation—and possibly BPD—is part of the picture.
BPD and Bipolar Disorder
Bipolar disorder, particularly Bipolar I, is a distinct condition but is often confused with BPD. Both can involve mood changes, but the patterns differ. Bipolar disorder involves discrete mood episodes. BPD involves rapid, trigger-linked emotional reactivity, especially in relationships.
Clinical takeaway: Accurate differentiation matters because treatment approaches differ significantly.
How the DSM Defines and Diagnoses Borderline Personality Disorder (BPD)
Important Considerations
The DSM provides diagnostic criteria to support consistency and communication in mental health care. It does not explain the cause of BPD or define an individual’s identity.
A diagnosis of BPD is best understood as a clinical framework that helps guide treatment and support—not as a judgment about character or worth.
According to the DSM, BPD involves a pervasive pattern of instability in:
- Emotions
- Interpersonal relationships
- Self-image
- Behavior
The most recent version of the DSM (Diagnostic and Statistical Manual of Mental Disorders) defines BPD as a mental health condition characterized by persistent patterns of emotional, relational, and behavioral instability.
These patterns typically begin by early adulthood and are present across multiple contexts, such as relationships, work, and daily life.
DSM Diagnostic Criteria for BPD
The DSM outlines nine diagnostic criteria for borderline personality disorder, and a diagnosis is made when at least five are present (expand the ‘read more’ section below for descriptions of each):
- Intense Fear of Abandonment
- Unstable or Rapidly Changing Relationships
- Unstable Sense of Self or Identity
- Impulsive or Self-Damaging Behaviors
- Suicidal Thoughts or Self-Harm Behaviors
- Intense and Rapidly Shifting Emotions
- Chronic Feelings of Emptiness or Low Self-Worth
- Difficulty with Anger or Intense Emotional Expression
- Stress-Related Changes in Thinking or Perception
Because an individual must meet only five of nine characteristics, BPD can present differently from person to person. In clinical practice, however, certain patterns appear more consistently—particularly chronic emotion dysregulation and difficulties in relationships—while other features vary more widely.
Read More About the DSM Criteria for BPD
We describe the 9 diagnostic criteria in ways that reflect lived experience, research findings, and the emotional processes beneath them. These features are interconnected and understood as patterns that develop over time, rather than as isolated behaviors or emotional reactions.
1. Intense Fear of Abandonment
A strong sensitivity to real or perceived rejection, distance, or loss of connection. This may lead to heightened emotional responses or urgent efforts to maintain closeness, especially during moments of stress or uncertainty.
2. Unstable or Rapidly Changing Relationships
Relationships may feel intense, emotionally charged, or unpredictable. Shifts in closeness often reflect emotional vulnerability and sensitivity to perceived changes in others’ availability or responsiveness.
3. Unstable Sense of Self or Identity
Difficulty maintaining a consistent sense of self, values, or goals. This may include self-doubt, fluctuating self-esteem, or uncertainty about one’s identity or direction in life.
4. Impulsive or Self-Damaging Behaviors
Impulsive actions—such as risky behaviors, substance use, or spending—often occur in response to overwhelming emotions. These behaviors are typically attempts to manage distress rather than intentional self-harm.
5. Suicidal Thoughts or Self-Harm Behaviors
Recurrent thoughts of suicide, self-harm, or related behaviors may emerge during periods of intense emotional pain. These are best understood as signals of distress and efforts to cope, not attention-seeking.
6. Intense and Rapidly Shifting Emotions
Emotions may escalate quickly, feel extremely painful, and take longer to settle. Mood shifts are often reactive to environmental or interpersonal triggers rather than occurring in discrete episodes.
7. Chronic Feelings of Emptiness or Low Self-Worth
Many individuals experience persistent feelings of inner emptiness, worthlessness, or emotional numbness. Others describe this more as low self-esteem, harsh self-judgment, or a lack of inner stability.
8. Difficulty with Anger or Intense Emotional Expression
Strong emotional reactions—sometimes expressed as anger—can occur when emotions feel overwhelming. Research and clinical experience show that shame is often more central and more common than anger, even when anger is more visible.
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A Note on Anger and Shame
Problems with anger are included in the DSM description of BPD, and anger can certainly be present. However, research and clinical experience suggest that shame is often far more common and more central than anger for many individuals with BPD.
Anger is more visible and therefore more likely to be emphasized, while shame is frequently internalized and overlooked. Understanding this distinction is important for reducing stigma and for providing care that addresses the emotions people with BPD experience most intensely.
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9. Stress-Related Changes in Thinking or Perception
During periods of high stress or emotional overload, individuals may experience transient paranoia, dissociation, or difficulty thinking clearly. These experiences are typically short-lived and closely tied to emotional intensity.
How Clinicians Evaluate Symptoms
A clinical assessment may involve:
- A detailed clinical interview exploring current concerns, emotional experiences, relationships, and developmental history
- Review of symptom history and duration to determine whether difficulties have been present over time and across situations
- Evaluation of emotional, relational, and behavioral patterns, rather than individual behaviors in isolation
- Consideration of alternative or co-occurring diagnoses, given the overlap between many mental health conditions
Clinicians assess whether these patterns are:
- Persistent over time
- Pervasive across contexts
- Associated with meaningful impairment in functioning
Understanding how diagnosis is made helps shift the focus away from labels and toward the underlying patterns that matter most. Regardless of how diagnostic language evolves, the challenges associated with chronic emotion dysregulation and relational instability remain real and require effective, compassionate care.
How the DSM’s Description of BPD Has Changed Over Time
The DSM has described borderline personality disorder (BPD) for more than four decades. While the way BPD is classified and discussed has evolved, the core understanding of the condition has remained largely consistent.
DSM-III (1980): First Formal Definition – BPD was officially introduced as a diagnosis in DSM-III. This marked the first time it was clearly defined using specific criteria rather than vague or theoretical descriptions.
At this stage, BPD was described as a pattern of:
- Intense and unstable relationships
- Strong and rapidly changing emotions
- Impulsive behaviors
- Unstable sense of self
- Stress-related symptoms such as paranoia or dissociation
This edition established BPD as a distinct condition rather than something “in between” other diagnoses.
DSM-IV (1994): Clarifying Without Major Changes – In DSM-IV, the basic description of BPD stayed the same. The manual continued to list nine characteristics, with a diagnosis made when any five were present.
The language was refined and clarified, and the overall understanding of BPD did not change. The emphasis remained on long-standing patterns of emotional, relational, and behavioral instability.
DSM-5 (2013) and DSM-5-TR (2022): Same criteria, New Context – In DSM-5, the formal criteria for BPD stayed exactly the same as in DSM-IV. What changed was the broader context:
- Personality disorders were no longer placed in a separate category from other mental health conditions
- The DSM introduced an alternative model that looks at personality functioning and traits, though this model is optional and not used for most diagnoses
Despite ongoing discussion about new ways to describe personality disorders, the original BPD criteria remain the primary diagnostic standard.
DSM-6 (Future): Ongoing Discussion – There is no published DSM-6 yet, and no finalized changes to how BPD will be diagnosed. Researchers and clinicians continue to explore more dimensional and less stigmatizing ways to describe personality and emotional difficulties, and any future updates including a name change remain under development.
What Has Stayed the Same
Across all DSM editions, BPD has consistently been understood as involving:
- Chronic difficulty regulating emotions
- Instability in relationships and self-image
- Patterns that develop over time, not isolated behaviors
While diagnostic language and structure may change, the lived experience and underlying challenges associated with BPD have remained clearly recognized.
How the ICD Defines and Diagnoses Borderline Personality Disorder (BPD)
Important Considerations
Like the DSM, the ICD provides a clinical framework to support diagnosis, treatment planning, and communication. It does not define a person’s identity or explain the full complexity of their lived experience.
The ICD-11 approach emphasizes understanding patterns of emotional and relational functioning rather than assigning rigid labels.
In ICD-11 (the most current version), borderline personality disorder is not listed as a separate standalone diagnosis. Instead, it is described using a dimensional model of personality disorder, with an optional “borderline pattern” specifier.
Under the ICD-11, a personality disorder is defined as a persistent disturbance in:
- How a person experiences and understands themselves
- How they relate to others
- How they regulate emotions and behavior
These patterns are long-standing, inflexible, and associated with significant distress or impairment in functioning.
In ICD-11, clinicians may add a “borderline pattern” specifier when an individual’s presentation includes features traditionally associated with borderline personality disorder.
This pattern is characterized by difficulties such as:
- Marked emotional instability
- Intense and unstable relationships
- Fear of abandonment
- Unstable self-image
- Impulsivity
- Self-harm or suicidal behaviors
- Chronic feelings of emptiness
The specifier is used to describe the style and pattern of emotional and relational functioning, rather than to assign a fixed category.
How Diagnosis Is Made in the ICD-11
Diagnosis under the ICD-11 involves:
- Determining whether a personality disorder is present
- Assessing the severity (mild, moderate, or severe)
- Identifying prominent trait domains
- Adding a borderline pattern specifier when appropriate
This approach emphasizes how functioning is affected, rather than counting a specific number of symptoms.
Relevant Changes to the ICD Over Time
ICD-10 (Introduced 1992; In Effect 1993)
With the publication of ICD-10 in 1992 (and implementation beginning in 1993), the World Health Organization introduced the term “Emotionally Unstable Personality Disorder, borderline type.” This marked the point at which borderline personality disorder was formally classified under the broader category of emotionally unstable personality disorder, with “borderline type” specified as a distinct presentation. In this system, BPD is recognized as a specific diagnostic category.
ICD-11 (Published 2019; In Effect 2022)
In ICD-11, published in 2019 and officially in effect as of January 1, 2022, the term borderline personality disorder is no longer used as a standalone diagnosis. Instead, ICD-11 uses a dimensional model of personality disorder. Clinicians diagnose a personality disorder based on severity and may add a “borderline pattern” specifier to describe features traditionally associated with BPD.
Key Differences in the ICD Approach
The ICD-11 framework:
- Focuses on emotional and interpersonal functioning
- Uses a dimensional severity-based model
- Allows for more individualized descriptions
- Aims to reduce stigma associated with categorical labels
The borderline pattern specifier helps clinicians communicate important clinical features while recognizing that personality presentations exist on a spectrum.
DSM vs. ICD: How BPD Is Described Across Diagnostic Systems
Although the terminology in each of the manuals differs, they describe largely the same underlying challenges—particularly chronic emotion dysregulation and difficulties in relationships. Most individuals who meet diagnostic criteria in one system would also meet criteria in the other, but there is not complete overlap. This lack of one-to-one correspondence highlights the inherent limitations and imperfections of diagnostic systems and underscores the importance of clinical judgment.
Read more about the differences between BPD in the DSM and ICD
| Area | DSM (Diagnostic and Statistical Manual of Mental Disorders) | ICD (International Classification of Diseases) |
| Primary Use | Primarily used in the United States | Used internationally outside the U.S. |
| Diagnostic Name | Borderline Personality Disorder (BPD) | Emotionally Unstable Personality Disorder (EUPD) |
| Overall Structure | Checklist-based diagnostic model | Descriptive, pattern-based diagnostic model |
| Number of Criteria | 9 criteria; diagnosis requires any 5 of 9 | Does not use a strict “5 of 9” checklist |
| Required Core Feature | No single required feature specified | Emphasizes emotional instability as central |
| Focus of Description | Individual symptoms listed separately | Broader description of emotional, relational, and behavioral patterns |
| Emotion Dysregulation | Included, but not formally required | Central and explicit |
| Relationship Difficulties | Framed as unstable or intense relationships and fear of abandonment | Described as instability in relationships and sensitivity to interpersonal stress |
| Identity and Self-Concept | Identity disturbance and chronic emptiness | Disturbance in self-image and sense of self |
| Behavioral Dysregulation | Impulsivity and suicidal/self-harming behaviors listed separately | Impulsivity and self-harm described as part of emotional instability |
| Cognitive/Stress-Related Symptoms | Stress-related paranoia or dissociation included | Stress-related symptoms included descriptively |
| Language Style | More technical and symptom-focused | More narrative and descriptive |
| Overlap Between Systems | High overlap with ICD criteria | High overlap with DSM criteria |
| Key Difference | Diagnosis based on meeting a threshold of symptoms | Diagnosis based on overall pattern and severity |
| What This Means Clinically | Same underlying problems may be labeled differently | Same underlying problems may be described differently |
Diagnostic systems are not static. Both the DSM and ICD continue to evolve as research and clinical understanding grow. While future revisions are anticipated, changes in diagnostic language reflect efforts to improve accuracy, clarity, and clinical usefulness, not to deny or minimize lived experience.
These systems are shaped by different scientific, cultural, and international considerations. Understanding this context helps place diagnosis where it belongs: as a tool to support care, communication, and treatment planning—not as a definitive explanation of a person’s experience.