Personality Disorders & Neurodivergence
What are personality disorders?
A personality disorder is a pattern of thinking, feeling, and behaving that differs significantly from what is expected, is rigid and long-standing, and causes distress or impairment. It affects how you experience yourself, relate to others, and manage emotions over time.
Personality disorders are among the most contested diagnoses in mental health. The label carries significant stigma, and there is ongoing debate about whether these patterns are best understood as disorders of personality or as responses to trauma and adversity.
This matters particularly for neurodivergent people, because personality disorder diagnoses - especially borderline personality disorder (BPD) - are frequently applied to autistic and ADHD people whose difficulties are better explained by their neurodevelopmental condition.
A changing diagnostic landscape
How personality disorders are classified is changing significantly. The ICD-11 has replaced the old categorical system (10 separate personality disorder types) with a dimensional model that focuses on severity and trait patterns. This has important implications for neurodivergent people.
The ICD-11 dimensional model
How it works
The ICD-11 represents a fundamental shift in how personality disorders are diagnosed. Instead of assigning one of 10 specific personality disorder types (as in the ICD-10 and DSM-5), the ICD-11 uses a single diagnosis of “personality disorder” with two additional specifications.
Severity - personality disorder is rated as mild, moderate, or severe, based on how much it affects functioning across different areas of life.
Trait domains - the pattern of personality difficulty is described using five trait domains:
- Negative affectivity - emotional instability, anxiety, insecurity, separation fears
- Detachment - social withdrawal, emotional distance, avoidance of intimacy
- Dissociality - callousness, exploitativeness, lack of empathy
- Disinhibition - impulsivity, risk-taking, irresponsibility
- Anankastia - perfectionism, rigid thinking, excessive orderliness and control
There is also a borderline pattern qualifier that can be added for people who show a pattern of emotional instability, unstable self-image, and relationship difficulties characteristic of what was previously called BPD.1
Why this matters for neurodivergent people
The dimensional model has several advantages for neurodivergent people.
It reduces the risk of categorical misdiagnosis. Under the old system, an autistic woman with emotional dysregulation and relationship difficulties could easily meet the checklist criteria for BPD - even when her difficulties were better explained by autism, masking, and sensory overwhelm. The dimensional model encourages clinicians to consider the underlying pattern and severity rather than ticking boxes.
It emphasises severity and functional impact rather than type. This requires clinicians to think about whether personality pathology is genuinely present and how much it affects the person’s life, rather than simply matching symptoms to a category.
It allows for more nuanced formulation. A person can have some personality traits that are prominent (such as negative affectivity) without meeting the full criteria for a personality disorder - reflecting the reality that personality difficulties exist on a spectrum.
Differential diagnosis guidance
Research on the ICD-11 model has highlighted the need for careful differential diagnosis between personality disorder and autism spectrum disorder, particularly in adolescents and young adults where both conditions may present with similar surface features. The dimensional approach is considered better suited to capturing this complexity than categorical diagnosis.1
The misdiagnosis problem
The most significant issue at the intersection of personality disorders and neurodivergence is misdiagnosis - particularly the misapplication of BPD/EUPD to autistic women.
Research shows that 17.9% of autistic women had been previously misdiagnosed with a personality disorder before receiving an autism diagnosis. When these women finally received their autism diagnosis, many described it as life-changing - shifting the frame from “something is wrong with your personality” to “your brain works differently.”2
This misdiagnosis is not just an academic concern. It leads to the wrong treatment (therapy aimed at changing personality rather than accommodating neurodevelopmental difference), additional stigma (BPD carries particularly heavy stigma in healthcare settings), and a phenomenon called diagnostic overshadowing - where once BPD is in the clinical notes, all subsequent presentations are interpreted through that lens, making it even harder for autism to be recognised.3
Why misdiagnosis happens
Several features are shared between autism and BPD on the surface but have fundamentally different origins:
- Emotional intensity in autism reflects sensory overload, burnout, or the cost of masking - not the abandonment-driven instability of BPD
- Unstable sense of self in autism often reflects the experience of masking in different contexts - not the identity disturbance of BPD
- Relationship difficulties in autism relate to communication differences and social exhaustion - not the fear-of-abandonment-driven patterns of BPD
- Self-harm in autism often relates to overwhelming sensory or emotional distress - not impulsive, rejection-triggered behaviour
Similarly, ADHD features like emotional dysregulation, impulsivity, and rejection sensitivity are frequently mistaken for BPD, when they are in fact neurological features of ADHD.
If you have been diagnosed with a personality disorder
This does not mean there is something fundamentally wrong with you. If you are neurodivergent, it may mean that your neurodevelopmental differences were not recognised or understood when the diagnosis was made. It is always worth seeking reassessment from a clinician who understands both neurodivergence and personality pathology.
Can you have both?
Yes. It is possible to be neurodivergent and have genuine personality difficulties. Neurodivergent people experience higher rates of trauma, and trauma is a significant contributor to personality pathology. Growing up undiagnosed, misunderstood, or bullied can shape how you relate to yourself and others in ways that go beyond neurodevelopmental difference alone.
The key is getting assessed by someone who understands both areas - who can distinguish what is explained by neurodivergence, what is explained by trauma, and what may genuinely reflect personality pathology requiring its own treatment.
Pages in this section
- BPD and neurodivergence - the overlap, misdiagnosis, and getting the right support
- ASPD and neurodivergence - impulsivity, empathy, and the criminal justice system
Further reading on neurobetter
neurobetter services
- Local services directory - find mental health services near you
- Ask a Counsellor - get a confidential response from a registered counsellor
If you are in crisis
If you are struggling right now, please visit our Get Help Now page for immediate support options, including Samaritans (116 123), Crisis Text Line (text SHOUT to 85258), and NHS 111.
-
Bach, B. and Vestergaard, M. (2023). Differential diagnosis of ICD-11 personality disorder and autism spectrum disorder in adolescents. Children, 10(6), 992. https://doi.org/10.3390/children10060992 ↩
-
Tamilson, B., Eccles, J.A. and Shaw, S.C.K. (2025). The experiences of autistic adults who were previously diagnosed with borderline or emotionally unstable personality disorder: A phenomenological study. Autism, 29(2), pp. 504-517. https://doi.org/10.1177/13623613241276073 ↩
-
Kentrou, V., Livingston, L.A., Grove, R. et al. (2024). Perceived misdiagnosis of psychiatric conditions in autistic adults. The Lancet Psychiatry, 11(6). https://doi.org/10.1016/S2215-0366(24)00126-7 ↩
This page has had one contribution from our team and community, and was last updated on 19 February 2026. Keeping this content up-to-date is a difficult task, especially as details can change quickly. We welcome feedback on any of the content in the Advice Hub, including any lived experience you can share. Please login or create an account to submit feedback.
neurobetter's content and services are intended to provide information, peer support, and connections to services. They are not intended to replace, override, or contradict medical or psychological advice provided by a doctor, psychologist or other healthcare professional.