Autism and borderline personality disorder in girls can involve overlapping experiences, including emotional dysregulation, relationship difficulties and feeling misunderstood. This article explores masking, childhood invalidation and diagnostic overlap while recognizing that autism and BPD are distinct and can also co-occur.
However, growing research suggests that these conditions share important characteristics, particularly in girls and women. Researchers are also beginning to examine whether the social and emotional experiences of growing up autistic, especially without appropriate recognition and support, may contribute to the development of BPD symptoms.
This raises an important question: What happens when a child who experiences the world differently spends years being told that her emotions, reactions, and needs are wrong?
Why Autism Is Frequently Missed in Girls
Historically, much of our understanding of autism developed from research involving boys. As a result, autism assessments and diagnostic expectations have not always adequately captured how autism may present in girls.
Some autistic girls demonstrate strong verbal abilities, maintain friendships, appear socially motivated, and perform well academically. They may be highly observant of others and develop sophisticated strategies to compensate for differences in social communication.
These strategies are often referred to as masking or social camouflaging.
An autistic girl may consciously study how others interact, rehearse conversations, imitate facial expressions, or suppress behaviors that make her appear different. Although these strategies may help her navigate social situations, they can also require considerable mental and emotional effort.
A systematic review of research on social camouflaging in autistic females found evidence that masking may help individuals adapt socially while also carrying negative consequences for well-being.
For some girls, the emotional cost becomes more apparent during adolescence, when friendships become increasingly complicated, social expectations intensify, and relationships require more nuanced communication.
A girl who appeared to function relatively well during childhood may suddenly begin experiencing significant anxiety, emotional outbursts, social withdrawal, self-injury, or relationship difficulties.
Rather than recognizing an underlying neurodevelopmental difference, these difficulties may be interpreted as mood instability, oppositional behavior, or emerging personality pathology.
The autism was not necessarily absent during childhood. It may simply have gone unrecognized.
Why Autism and BPD Can Look So Similar
Autism and BPD are distinct conditions, but they can share outward characteristics that complicate diagnosis.
Both may involve intense emotional reactions, difficulty identifying emotions, interpersonal conflict, rejection sensitivity, and periods of significant emotional distress.
For example, an autistic teenager may become extremely upset when a friend unexpectedly changes plans. From the outside, her reaction might resemble the abandonment sensitivity commonly associated with BPD.
However, the underlying reasons may be different.
For the autistic teenager, the distress may stem from unexpected change, difficulty adjusting expectations, uncertainty about social rules, or the overwhelming cognitive demands of navigating an unpredictable situation.
For an adolescent with BPD, a similar reaction may be more strongly connected to fears of rejection, abandonment, or perceived changes in the relationship.
These explanations are not mutually exclusive. An autistic teenager who has repeatedly experienced rejection may also develop significant fears of abandonment.
A 2026 study comparing women and people assigned female at birth with autism or BPD found meaningful differences between the groups. Sensory processing differences, social camouflaging, and preference for sameness were more characteristic of the autistic group. Identity disturbance, rejection sensitivity, and greater emotional dysregulation were more characteristic of the BPD group.
The findings reinforce why clinicians must examine not only what a behavior looks like, but also what is driving it.
The Emotional Consequences of Growing Up Undiagnosed
Imagine a young girl who experiences emotions intensely, becomes overwhelmed by sensory stimulation, struggles to interpret social situations, and requires additional time to process unexpected changes.
Her parents may describe her as overly sensitive. Teachers may believe she is capable but unwilling to cooperate. Peers may consider her strange, dramatic, or difficult.
She may repeatedly hear statements such as:
- “You’re overreacting.”
- “Why can’t you just let it go?”
- “Stop being so sensitive.”
- “You need to learn how to act like everyone else.”
- “There’s nothing to be upset about.”
These responses are not necessarily intended to be harmful. Parents and teachers may genuinely believe they are helping a child develop resilience or appropriate social behavior.
However, when a child’s neurological differences are not recognized, adults may repeatedly respond to genuine distress as though it is intentional misbehavior or an inappropriate emotional response.
Over time, the child may begin questioning her own emotional experiences.
She may learn that expressing distress leads to criticism, that asking for accommodations makes her difficult, or that maintaining relationships requires hiding important aspects of herself.
This can contribute to shame, confusion about identity, emotional suppression, and difficulty trusting her own perceptions.
The problem is not simply that the child experiences intense emotions. It is that she may have limited opportunities to understand those emotions, communicate her needs effectively, and receive support appropriate to her neurological functioning.
How Childhood Invalidation Connects to Borderline Personality Disorder
Dr. Marsha Linehan’s biosocial theory of borderline personality disorder proposes that significant emotion dysregulation develops through the interaction between biological emotional vulnerability and an invalidating environment.
Biological vulnerability may involve heightened emotional sensitivity, intense emotional responses, and difficulty returning to emotional baseline.
An invalidating environment is one in which emotional experiences are repeatedly dismissed, misunderstood, punished, or responded to inconsistently.
Importantly, invalidation does not require abuse or neglect. It can occur in loving families when caregivers do not understand the intensity or function of a child’s emotional experiences.
For autistic children, this interaction may be especially relevant.
An autistic girl may have genuine neurological differences that make certain experiences more distressing than they are for others. When those differences are repeatedly misunderstood, she may receive the message that her internal experiences are inaccurate or unacceptable.
A 2023 peer-reviewed narrative review specifically examined the application of Linehan’s biosocial model to emotion dysregulation in autism. The authors described how biological vulnerabilities, sensory differences, social misunderstandings, and invalidating experiences may interact to contribute to emotional difficulties in autistic individuals.
Research on BPD also supports an association between childhood invalidation and later symptoms. A meta-analysis involving 21 studies and 7,198 participants found significant associations between reported parental invalidation and BPD symptoms.
These findings suggest that chronic invalidation may be one important factor in the development of emotion dysregulation.
However, not every autistic child who experiences invalidation develops BPD, and childhood invalidation is not the sole explanation for borderline personality disorder.
Can Undiagnosed Autism Contribute to the Development of BPD?
This is one of the most important emerging questions in autism and personality disorder research.
A study published in Personality and Mental Health in 2026, titled The Role of Social Adversity in the Association Between Autistic Traits and Borderline Personality Disorder Symptoms, examined data from 7,403 individuals.
Researchers investigated whether experiences such as victimization and lack of social support were associated with the relationship between autistic traits and BPD symptoms.
They found that both victimization and limited social support were involved in this relationship.
Importantly, the association between victimization and BPD symptoms was stronger among individuals with higher levels of autistic traits.
The researchers proposed that autistic individuals may experience a form of double vulnerability: greater exposure to social adversity and greater susceptibility to some of its effects.
These findings support a possible developmental pathway in which an autistic individual experiences repeated rejection, bullying, invalidation, or interpersonal trauma, contributing to emotional and relational difficulties associated with BPD.
However, the study was observational and measured autistic traits and BPD symptoms rather than establishing a developmental sequence of confirmed diagnoses. It cannot demonstrate that undiagnosed autism directly causes BPD.
The findings nevertheless raise important questions about whether earlier recognition of autism, appropriate accommodations, and supportive environments could reduce some of the psychological difficulties that develop over time.
When Masking Becomes an Identity Problem
One particularly important area of overlap between autism and BPD involves identity.
Identity disturbance is a diagnostic characteristic of BPD. Individuals may struggle to maintain a stable sense of who they are, what they value, or how they see themselves.
Autistic girls who engage in extensive masking may experience a different but potentially related struggle.
A girl who spends years adjusting her personality, interests, communication style, and behavior to meet other people’s expectations may eventually have difficulty identifying her authentic preferences and needs.
She may become highly dependent on external feedback to determine whether she is behaving appropriately.
In relationships, she may constantly monitor the other person’s facial expressions, tone of voice, and reactions. She may change her behavior to avoid rejection or conflict.
Although these behaviors may initially develop as strategies for navigating social differences, they can contribute to exhaustion, anxiety, and difficulties with self-concept.
For some individuals, these experiences may resemble the identity instability observed in BPD.
This does not mean masking causes BPD. It means clinicians should carefully consider whether apparent identity difficulties reflect longstanding personality pathology, the consequences of chronic camouflaging, trauma-related adaptations, or a combination of these factors.
Rejection Sensitivity, Relationships, and Fear of Abandonment
Autistic girls may experience repeated social rejection even when they strongly desire friendships and close relationships.
They may misunderstand subtle social expectations, miss unspoken rules, or communicate in ways that peers interpret differently than intended.
Over time, repeated friendship losses, bullying, exclusion, or criticism can make social relationships feel unpredictable and unsafe.
A teenager who has repeatedly experienced rejection may become hypervigilant to changes in other people’s behavior.
A delayed text message, an unexpected change in tone, or a canceled plan may trigger intense anxiety.
In some cases, the teenager may withdraw to protect herself. In others, she may seek repeated reassurance, become emotionally overwhelmed, or react impulsively.
These responses can resemble BPD-related interpersonal sensitivity.
The important clinical question is whether these behaviors reflect autism-related social uncertainty, learned responses to rejection, BPD-related abandonment fears, or overlapping processes.
Autism does not prevent someone from developing BPD, and a BPD diagnosis does not rule out underlying autism.
Both conditions deserve careful assessment rather than assuming one diagnosis explains everything.
Why Accurate Diagnosis Matters
A 2025 peer-reviewed conceptual analysis examining autism and BPD in girls and women highlighted the risk of autistic characteristics being misinterpreted as borderline personality traits.
The authors emphasized the importance of developmental history, masking, trauma, and the social experiences of autistic girls and women.
A clinician evaluating an adolescent with emotional instability should consider whether social communication differences, sensory sensitivities, rigid thinking patterns, repetitive behaviors, or difficulty managing unexpected changes were present earlier in development.
It is also important to understand when emotional and interpersonal difficulties began.
Were the child’s difficulties apparent before adolescence but interpreted as personality traits? Did symptoms become more severe after years of bullying or social exclusion? Are emotional episodes primarily triggered by sensory overload, changes in routine, perceived rejection, or some combination?
These distinctions are important because effective treatment requires understanding the function and underlying causes of behavior.
An autistic adolescent who is overwhelmed by sensory input may need environmental accommodations and sensory regulation strategies. An adolescent experiencing intense abandonment fears may need additional interventions targeting interpersonal sensitivity, attachment-related beliefs, and emotion regulation.
An individual experiencing both may benefit from an integrated approach.
How DBT Can Help Autistic Girls and Adolescents With BPD Traits
Dialectical Behavior Therapy (DBT) is an evidence-based treatment developed for individuals experiencing significant emotion dysregulation, particularly those with BPD.
DBT teaches practical skills in mindfulness, distress tolerance, emotion regulation, and interpersonal effectiveness.
These skills can also be useful for autistic individuals experiencing emotional dysregulation, although adaptations may be necessary to address differences in sensory processing, communication, cognitive flexibility, and learning style.
For example, traditional DBT may encourage an individual to tolerate distress during an emotionally overwhelming situation. For an autistic adolescent, treatment must also consider whether the environment itself is creating excessive sensory or cognitive demands.
The goal should not be to teach an autistic person to tolerate harmful levels of overwhelm or mask their neurological differences more effectively.
Instead, treatment may focus on helping the individual recognize early signs of dysregulation, identify sensory and emotional triggers, communicate needs, establish boundaries, and develop effective coping strategies.
Parents also play an important role. Learning to validate emotional experiences while maintaining appropriate expectations can help create an environment that supports emotional development.
Validation does not mean agreeing with every interpretation or accepting ineffective behavior. It means communicating that the person’s emotional experience makes sense within the context of their circumstances.
For an autistic adolescent who has spent years feeling misunderstood, this distinction can be especially meaningful.
The Importance of Early Recognition and Support
One of the most important implications of this research is the potential value of identifying autism earlier, particularly in girls whose presentations do not fit traditional expectations.
Early recognition can help families understand why a child experiences certain situations differently and identify supports that address her actual needs.
It may also reduce repeated experiences of misunderstanding, punishment for disability-related behaviors, and pressure to conceal autistic characteristics.
Although research has not established that early autism diagnosis prevents BPD, reducing bullying, chronic invalidation, and unmet support needs is valuable regardless of whether an individual develops another mental health condition.
The goal is not to eliminate autism-related differences. It is to help autistic individuals develop a stable sense of identity, understand their emotional experiences, and navigate relationships without feeling that they must constantly suppress who they are.
Understanding the Whole Person
Autism and borderline personality disorder should not be viewed as interchangeable diagnoses, but neither should they be considered mutually exclusive.
For some girls and women, autism may have been overlooked while emotional and interpersonal difficulties became the primary focus of treatment. For others, genuine BPD symptoms may have developed alongside longstanding autistic traits, potentially influenced by repeated experiences of rejection, invalidation, and trauma.
Research increasingly supports the importance of considering both neurodevelopmental vulnerability and environmental experiences when understanding emotional dysregulation.
Rather than focusing exclusively on diagnostic labels, effective assessment and treatment should examine the individual’s developmental history, neurological differences, emotional experiences, relationships, and learning history.
A child who grows up feeling fundamentally misunderstood may develop ways of coping that make sense in the context of her experiences, even when those coping strategies eventually create additional difficulties.
Understanding how those patterns developed creates opportunities for more effective treatment, greater self-understanding, and meaningful change.
Specialized Autism and DBT Treatment in Louisville, Kentucky
At Wise Mind Behavioral Health in Louisville, Kentucky, we specialize in working with adolescents and adults experiencing emotion dysregulation, autism, ADHD, and borderline personality traits.
Our approach integrates Dialectical Behavior Therapy with an understanding of neurodevelopmental differences, behavioral learning, and the impact of environmental experiences.
Treatment focuses on helping individuals understand their emotional responses, develop effective coping strategies, improve relationships, and build a stronger sense of identity while respecting their individual neurological needs.
We also work with parents to improve communication, reduce invalidating interactions, and create environments that support both emotional acceptance and meaningful behavioral change.
Peer-Reviewed Research References
- Roberts, E., & Scott, L. (2026). The role of social adversity in the association between autistic traits and borderline personality disorder symptoms. Personality and Mental Health. https://doi.org/10.1002/pmh.70060
- Borderline personality as a factor in late, missed, and mis-diagnosis in autistic girls and women: A conceptual analysis. (2025). https://pmc.ncbi.nlm.nih.gov/articles/PMC11861065/
- Linehan’s biosocial model applied to emotion dysregulation in autism: A narrative review of the literature and an illustrative case conceptualization. (2023). https://pmc.ncbi.nlm.nih.gov/articles/PMC10570453/
- Overlapping and differentiating clinical features of autism and borderline personality disorder in women and people assigned female at birth: A cross-sectional study.(2026). https://pmc.ncbi.nlm.nih.gov/articles/PMC13087160/
- Parental invalidation and its associations with borderline personality disorder symptoms: A multivariate meta-analysis. (2022). https://pubmed.ncbi.nlm.nih.gov/34766788/
- Social camouflaging in females with autism spectrum disorder: A systematic review.(2020). https://pubmed.ncbi.nlm.nih.gov/32926304/
- Validating the biosocial model of borderline personality disorder: Findings from a longitudinal study. (2023). https://pubmed.ncbi.nlm.nih.gov/37702069/
For information about support in Louisville, Kentucky, explore autism support for teens and young adults or adolescent DBT at Wise Mind Behavioral Health. Contact the practice with questions about services and referrals.