Can You Have Both Antisocial and Borderline Personality Disorder?

You can absolutely have both antisocial personality disorder (ASPD) and borderline personality disorder (BPD) at the same time, and the combination is far from rare. In one large study of clinical patients, roughly one in ten met criteria for both disorders simultaneously.¹ The two conditions share enough symptoms and risk factors that some researchers have questioned whether they might even represent the same underlying vulnerability expressed differently depending on the person. That debate is unresolved, but the practical reality is clear: dual diagnosis happens, it changes the clinical picture in specific ways, and it creates real challenges for the people living with it and the clinicians trying to help.

How Common Is the Overlap?

Among adults hospitalized for psychiatric treatment, antisocial personality disorder stands out as one of the most frequent co-occurring diagnoses alongside BPD. One study of hospitalized adolescents and adults found that, among all personality disorders, ASPD was the only one with a statistically significant co-occurrence with BPD in the adult sample.² That finding is worth pausing on: of all the personality disorders a person with BPD could also qualify for, the antisocial type was the standout.

In a separate sample examining gender differences, about 14% of participants met criteria for BPD, about 37% met criteria for antisocial behavior patterns, and roughly 10% met criteria for both.¹ The overlap was present in both men and women, though women with BPD showed a somewhat higher rate of also meeting antisocial criteria (about 14% of women versus 8% of men). In forensic settings, the picture intensifies. Research on incarcerated individuals with ASPD has consistently found that borderline and narcissistic traits coexist alongside antisocial behavior, suggesting that in populations already selected for one diagnosis, the other is frequently lurking.³

Why the Two Disorders Overlap So Much

ASPD and BPD share more symptom territory than most people realize. Impulsivity is central to both. Unstable and intense interpersonal relationships show up in both. Anger problems are core features of each. These parallels have led some researchers to argue that the two disorders might reflect the same form of underlying psychopathology, shaped by gender and social expectations into what look like two separate diagnoses.⁴ The idea is provocative and still debated, but it helps explain why clinicians so frequently see them together.

Neuroimaging research adds weight to this connection. Brain scanning studies have found that both ASPD and BPD involve dysfunction in the same general brain circuitry, specifically the connections between the frontal lobes (which handle planning and impulse control) and the limbic system (which processes emotion and threat).⁵ When those circuits are underperforming, the result tends to be poor emotional regulation and difficulty controlling impulses, hallmarks of both disorders. This shared neural substrate makes it less surprising that the same person could develop features of both.

What Actually Differs Between the Two

Despite the overlap, the disorders are not interchangeable, and the differences matter for understanding someone who carries both diagnoses. Research using detailed symptom-by-symptom analysis has found that people with BPD alone tend to score highest on fear of abandonment, unstable relationships, identity disturbance, and suicidality. People with both BPD and ASPD, on the other hand, tend to score highest on impulsivity, emotional instability, and difficulty controlling anger.⁶ The dual-diagnosis group also showed the greatest overall severity of borderline symptoms, the most emotional dysregulation, and the highest impulsiveness of any group studied.

That last point deserves emphasis. Having both disorders does not average out the symptoms. It tends to amplify them. The combination appears to create a profile that is more intense and more disruptive than either disorder alone, particularly in the domains of anger, impulsivity, and emotional volatility. Someone with BPD alone might struggle mostly with identity and relationship instability; someone with both is more likely to struggle with those issues and with explosive behavioral dyscontrol.

Different Roads to Aggression

Both ASPD and BPD are associated with aggressive behavior, but the pathway to that aggression appears to be fundamentally different. In BPD, aggression tends to be driven by emotional dysregulation. The person feels overwhelmed by emotion, cannot bring it under control, and the result spills out as verbal or physical aggression. ASPD-related aggression, by contrast, appears to bypass that emotional bottleneck entirely. One prospective study found that ASPD symptoms were directly associated with physical assault but were not linked to emotion dysregulation or to the kind of psychological aggression more characteristic of BPD.⁷

For someone carrying both diagnoses, this means aggression can arrive from two separate sources. There may be emotionally triggered outbursts characteristic of BPD alongside more calculated or instrumentally motivated antisocial behavior. This dual pathway is part of what makes the combination clinically challenging: the triggers are different, the motivations are different, and the interventions that address one pathway may not touch the other.

How Gender Bias Muddies the Diagnostic Picture

One of the most significant practical problems with diagnosing co-occurring ASPD and BPD is that clinicians’ judgments are not immune to gender stereotypes. BPD has long been stereotyped as a “female” disorder, while ASPD has been stereotyped as “male.” Those stereotypes actively distort diagnoses. A study examining psychiatrists’ diagnostic decisions found that a woman presenting with antisocial personality disorder was roughly five times more likely to be misdiagnosed than a man with the same condition. The misdiagnosis typically went in a predictable direction: women with ASPD were labeled as having BPD instead.⁸

The reverse pattern, men with BPD being misdiagnosed with ASPD, also shows up in the literature. At the same level of underlying borderline traits, men tend to endorse symptoms like intense anger and impulsivity more strongly, while women tend to endorse chronic emptiness, emotional instability, and self-harm behaviors more strongly.⁹ When a man walks into a clinician’s office reporting anger and impulsive behavior, the clinician may reach for ASPD before considering BPD, even when BPD fits the full picture better.

For someone who genuinely has both disorders, this bias creates a real risk. If a clinician defaults to one diagnosis based on the patient’s gender, they may never investigate the second one. A woman whose antisocial features are read as borderline will miss out on treatment strategies that target antisocial behavior specifically. A man whose borderline features are read as antisocial may never be offered the emotion-regulation skills training that could help him most. The lesson for patients and families is worth knowing: if one personality disorder diagnosis has been given and the presentation does not seem fully captured by it, raising the possibility of co-occurrence is reasonable.

The Psychopathy Question

A related debate in the research literature asks whether BPD in women and psychopathy in men might sometimes be expressions of the same underlying disposition. Psychopathy is not a formal diagnostic category in the same way ASPD is, but it overlaps heavily with ASPD, particularly in its impulsive and antisocial dimensions. Two independent studies found that in women specifically, the combination of high scores on both the interpersonal-affective and the antisocial-lifestyle dimensions of psychopathy was associated with meeting criteria for BPD. That association was specific to women in at least one of the samples.¹⁰

This does not mean every woman with BPD is psychopathic, or that BPD and psychopathy are the same thing. But it suggests that some of the personality traits captured under the umbrella of “psychopathy” in men may, in women, be captured under the umbrella of “BPD” instead. Whether this reflects genuine biological differences, different socialization experiences, or diagnostic biases (or all three) remains an open question. For a person who has both ASPD and BPD, these findings offer an indirect piece of the puzzle: the two conditions may share not just surface symptoms but deeper dispositional roots.

How Co-Occurrence Affects Intimate Relationships

Both ASPD and BPD individually raise the risk of intimate partner violence, but the mechanisms differ in ways that matter for the people involved. A dyadic study examining couples found that both partners’ own ASPD scores predicted their perpetration of intimate partner violence. For BPD, the picture was more complex: a man’s violence was predicted not only by his own borderline features but also by his female partner’s borderline features, though this cross-partner effect did not hold in the other direction.¹¹

What this means in practical terms is that when one or both partners carry features of both disorders, the relationship dynamics can become volatile from multiple directions simultaneously. The emotional reactivity of BPD interacts with the rule-breaking and callousness features of ASPD, and the combination amplifies conflict. Partners and family members of someone with a dual diagnosis often report feeling caught between episodes of intense emotional neediness and periods of cold, self-serving behavior. Understanding that these two patterns have different sources can be helpful for both the person affected and those around them.

Cultural Variation in How Symptoms Appear

The way ASPD and BPD symptoms show up is not entirely universal. Research has found indications that BPD manifests differently in Western societies with an individualistic and competitive orientation compared to more traditional collectivist societies.¹² Identity disturbance, for example, may look different in a culture where individual identity is emphasized versus one where identity is more defined by family and community roles. Similarly, the kinds of impulsive or antisocial behavior that get someone noticed by the legal or mental health system vary by cultural context.

This has practical implications for diagnosis. If the specific behavioral expressions of BPD and ASPD shift depending on cultural setting, then so does the apparent overlap between the two disorders. A person in one cultural context might present symptoms that cleanly fit one category, while in another context the same underlying traits might blur across both diagnoses. Clinicians working with patients from diverse backgrounds need to account for this, but patients themselves should also be aware: a diagnostic label applied in one setting may not perfectly capture how the disorder looks in another.

Treatment When Both Diagnoses Are Present

Treating co-occurring ASPD and BPD is harder than treating either alone, in part because the evidence base is thinner and the disorders pull treatment in different directions. BPD has several well-studied psychotherapy approaches, including dialectical behavior therapy, mentalization-based treatment, and schema therapy, all of which have been adapted and tested specifically for borderline presentations. ASPD, by contrast, has a much smaller treatment literature, and what exists tends to focus narrowly on managing impulsive aggression rather than changing the broader personality pattern.

On the medication side, the options for ASPD are limited. The best-supported pharmacological approaches target impulsive aggression specifically: lithium has been associated with reductions in serious rule-breaking in incarcerated men, and certain anti-seizure medications have shown effects on impulsive (but not premeditated) aggression.¹³ There is no medication that treats the core features of ASPD more broadly, and the same is largely true for BPD, where medications tend to target specific symptoms like mood instability or impulsivity rather than the disorder itself.

For someone with both diagnoses, the clinical approach typically involves addressing emotion dysregulation and interpersonal instability through BPD-focused therapies, while simultaneously working on the antisocial behavior patterns through structured interventions that target thinking errors, consequential reasoning, and behavioral management. The combination demands more from both the therapist and the patient, and progress tends to be slower. The impulsivity and emotional intensity of the dual-diagnosis presentation can make it harder to establish the therapeutic alliance that most treatments depend on.

When Clinicians See One Disorder but Miss the Other

Beyond the gender-bias issue discussed earlier, there are structural reasons why co-occurring ASPD and BPD gets underdiagnosed. Many mental health settings specialize in one population or the other. BPD is typically treated in outpatient psychiatric clinics and crisis settings. ASPD is more commonly encountered in forensic and correctional environments. A person who enters treatment through one door may never be assessed for the condition associated with the other door.

The stigma attached to both diagnoses compounds the problem. Personality disorder diagnoses in general carry more clinical stigma than most other mental health conditions, and ASPD is arguably the most stigmatized of all. Some clinicians are reluctant to add a second personality disorder diagnosis because they worry it will make the patient seem “too difficult” or reduce their access to care. Others genuinely believe that one diagnosis subsumes the other, that the antisocial features are “just part of” the borderline presentation, or vice versa. The research does not support that collapsing. As the symptom-level analyses show, the co-occurring group has a distinct profile with its own severity pattern, and treating them as if they have only one disorder misses important parts of the picture.⁶

For people navigating the mental health system with features of both disorders, seeking comprehensive personality assessment rather than a single-diagnosis screening can make a meaningful difference. Structured clinical interviews designed for personality disorders are more likely to catch co-occurring conditions than brief symptom checklists. If you recognize yourself in the descriptions of both disorders and have only been formally diagnosed with one, it may be worth asking your clinician to assess for the other explicitly.

The Ongoing Debate About Whether These Are Really Two Disorders

Behind all the clinical detail sits a deeper conceptual question that researchers have not yet settled. Some argue that ASPD and BPD are genuinely distinct conditions that happen to share risk factors and surface features. Others argue that the current diagnostic system carves the personality disorder landscape incorrectly, and that what we call ASPD and BPD are really different expressions of a shared vulnerability. The evidence for shared symptom structure, shared neural circuitry, and the gender-differentiated psychopathy findings all point toward substantial common ground.⁴

The alternative diagnostic model being developed alongside the traditional system takes a dimensional approach, rating personality pathology along continuous traits rather than sorting people into discrete categories. Under that model, someone with features of both ASPD and BPD would not need two separate labels. They would instead be described in terms of their specific trait profile: high antagonism, high disinhibition, high negative emotionality, and so on. Whether that approach eventually replaces the current system is an open question, but for now, both ASPD and BPD remain separate diagnoses, and a person can receive both. The conceptual debate matters for the future of diagnosis and treatment, but it does not change the present reality: if someone’s symptoms span both disorders, both should be recognized and addressed.

1
PubMed Central. A psychometric investigation of gender differences and common processes across Borderline and Antisocial Personality Disorders
2
PubMed. Comorbidity of borderline personality disorder with other personality disorders in hospitalized adolescents and adults
3
International Journal of Offender Therapy and Comparative Criminology. Axis II Comorbidity in Forensic Patients with Antisocial Personality Disorder
4
PubMed. Antisocial and borderline personality disorders revisited
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PubMed. Neuroimaging and personality disorders
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PubMed Central. Comorbidity of borderline with antisocial and narcissistic personality disorders: a multimethod study
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PubMed Central. Prospective associations between features of borderline personality disorder, emotion dysregulation, and aggression
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PubMed Central. Gender bias of antisocial and borderline personality disorders among psychiatrists
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PubMed Central. Gender differences in borderline personality disorder: a narrative review
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PubMed Central. Borderline personality disorder as a female phenotypic expression of psychopathy?
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PubMed Central. A Dyadic Analysis of the Relationships Between Antisocial and Borderline Personality and Intimate Partner Violence Perpetration
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Društvene i humanističke studije (Online). Antisocial and Borderline Personality Disorder: Cultural and Gender Differences in the Manifestation of Criminal Behavior
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Oxford Academic (International Journal of Neuropsychopharmacology). Evidence-based pharmacotherapy for personality disorders