The 'Empty' Feeling in BPD Isn't Emptiness. It's Something Stranger.

Ask someone with borderline personality disorder to describe themselves, and you may notice something unusual happen. Not hesitation, exactly. More like a kind of blankness where an answer should be. People will tell you what they like, what they hate, who they were yesterday, who they might be tomorrow. What they struggle to offer is a stable center that holds all of that together. It is not that the self is absent. It is that it keeps moving, keeps flickering, keeps reorganizing itself around whoever is in the room.

The DSM-5 calls this "markedly and persistently unstable self-image or sense of self" and lists it as one of nine diagnostic criteria for BPD. Most people familiar with the disorder focus on emotional dysregulation, self-harm, impulsivity, or the catastrophic fear of abandonment — features that announce themselves loudly in clinical settings and in the painful accounts of people living with the diagnosis. Identity disturbance is quieter and, in some ways, stranger. It sits behind the other symptoms, organizing them, and yet it has received far less sustained scientific attention than any of them.

That is beginning to change. A scoping review published in 2025^[4], led by researchers at the University of Barcelona, surveyed the existing literature on identity disturbance in BPD with the aim of mapping what the field actually knows — and what it conspicuously does not. What emerged was not a tidy synthesis. It was a portrait of a construct so inconsistently defined, so variably measured, and so poorly integrated across theoretical traditions that clinicians working from different frameworks can examine the same patient and barely be discussing the same phenomenon. The review found meaningful disagreement not just on how to assess identity disturbance, but on what it fundamentally is.

For people with BPD, this is not an abstract failure of academic coordination. It is a clinical reality with lived consequences. When the feature most responsible for the inner texture of the disorder cannot be reliably named, measured, or treated, the people experiencing it tend to feel — as many of them will tell you, in nearly identical language — like they are not being seen. Not the dramatic not-seen of being misunderstood. The quieter, more disorienting kind: like the part of you that is most sick is the part no one has a word for.

What Identity Disturbance Actually Means Clinically

The phrase "identity disturbance" is easy to mishear as something vague — an existential restlessness, the ordinary confusion of adolescence prolonged. Clinically it refers to something more specific and more structurally disruptive. The concept draws on several overlapping frameworks, and their partial compatibility is part of why the construct remains so contested.

One major tradition, rooted in Otto Kernberg's object relations theory, frames identity disturbance as identity diffusion: a failure of integration in which the self and significant others are experienced as split into radically inconsistent representations that never cohere into a stable whole. In this model, the person does not hold a unified sense of who they are because the psychological structures needed to integrate contradictory self-states — loving and hating, idealizing and devaluing, confident and worthless — remain fragmented. What looks like instability from the outside is, from the inside, the experience of living without a reliable internal narrator.

A second tradition, more influenced by cognitive-behavioral and schema models, understands identity disturbance in terms of incoherent or absent self-schemas: the mental frameworks through which people organize their beliefs about who they are, what they deserve, how relationships work. In BPD, these schemas tend to be either rigidly negative — schemas of defectiveness, abandonment, and shame — or wildly inconsistent, activating differently depending on relational context and emotional state. Neither version produces what healthy identity requires: a stable platform from which to perceive, evaluate, and respond to the world.

“The person does not hold a unified sense of who they are because the psychological structures needed to integrate contradictory self-states remain fragmented.”

A third angle comes from attachment research. From this perspective, stable identity is not purely an internal achievement — it is built in relationship, through attuned early caregiving that mirrors the child's states back to them in a way that is consistent, comprehensible, and not overwhelming. When early attachment is disrupted, unpredictable, or frightening, the internal working models that form identity remain disorganized. The child — and later the adult — never fully internalizes a coherent sense of self because no one ever reliably reflected one back.

These frameworks are not mutually exclusive. They are, in many cases, describing the same clinical reality from different vantage points. But they have generated different measures, different terminology, and different treatment implications. The Barcelona review found that across published studies, researchers were measuring everything from role confusion and inconsistent self-reports to narrative incoherence, dissociative identity experiences, unstable values, and the DSM's own criterion without consistent agreement about which of these was the essential construct and which were its downstream effects.

The Chronic Emptiness Problem

There is one feature of identity disturbance that patients describe repeatedly and that the clinical literature treats inconsistently: chronic emptiness. It appears in the DSM as a separate criterion from identity disturbance, but the experiential relationship between them is intimate enough that researchers and clinicians often struggle to pull them apart.

Chronic emptiness in BPD is not depression's flatness, though depression often co-occurs. It is not boredom, though people will sometimes use that word. The closest phenomenological description people tend to offer is something like: the absence of a felt self. Not the feeling of being empty, but the feeling of nothing being there to feel. It is the experiential signature of identity disturbance made legible as sensation — what it is like, from the inside, to not have a stable center.

This is partly why the symptom drives so many of the behaviors that characterize BPD. Intense relationships — idealization, fusion, desperate clinging — can temporarily fill the void because the other person's presence and response provides the sense of reality, realness, and definition that the internal self cannot independently sustain. When the relationship pulls away, the self pulls away with it, and what returns is not loneliness so much as dissolution. The frantic quality of abandonment panic in BPD is not only about losing a person. It is about losing a self.

“Chronic emptiness in BPD is not the feeling of being empty — it is the feeling of nothing being there to feel.”

Impulsive behavior serves a related function. Spending, substances, risky sex, binge eating — these are frequently described by people with BPD not as pleasures but as interruptions, ways of producing sensation that temporarily stands in for the absent internal experience of being a self. The behavior looks reckless from outside. From inside, it often reads as a way of confirming that you exist.

Why Measurement Failure Is a Clinical Problem, Not Just an Academic One

The Barcelona review's most important finding^[3] was not philosophical. It was operational. Across the studies surveyed, there was no consensus on how to measure identity disturbance — not which tools to use, not which dimensions to prioritize, not even whether it should be assessed as a categorical feature or a continuous one. Some studies used structured diagnostic interviews. Others relied on self-report scales. Some measured it narrowly through the specific criterion language. Others captured it through broader constructs like self-concept clarity or autobiographical coherence.

This creates a compounding problem. Without reliable measurement, treatment studies cannot accurately track whether interventions are actually addressing identity disturbance or simply improving emotional regulation, social functioning, and symptom severity — which often improve together but are not the same thing. Dialectical behavior therapy^[2], the best-evidenced treatment for BPD, was explicitly designed to address emotional dysregulation and behavioral impulsivity. It produces real reductions in self-harm, suicidality, and crisis episodes. What is less clear is how much it changes the underlying identity structure — the persistent difficulty knowing who you are that tends to persist even after the acute behavioral crises have settled.

Mentalization-based treatment and transference-focused psychotherapy, both psychodynamically informed approaches, are more explicitly targeted at identity and internal representational structure. But they are less widely available, longer in duration, and require training that most clinical settings do not invest in. The result is that the intervention with the most implementation infrastructure was not built primarily for the feature many clinicians consider most central to the disorder's architecture.

For patients, this gap is often felt as a persistent sense that something is being treated around their actual problem, not at it. They may learn distress tolerance skills, reduce crisis frequency, and still experience the fundamental sense of not-quite-being-a-person with the same weight as before. The symptom reduction is real and meaningful. But the emptiness remains, and when they try to name it in session, the language is often thin.

The Developmental Architecture Beneath the Symptom

Understanding why identity disturbance takes the particular shape it does in BPD requires understanding something about how a coherent self forms under ordinary conditions — and what interrupts that process.

Self-continuity, the sense of being the same person across time and context, depends on a set of interlocking capacities that develop in early relational experience. Mentalization — the ability to represent mental states in oneself and others — is one. Narrative self-coherence, the ability to construct a story of one's own life that connects past, present, and anticipated future into something recognizable, is another. Object constancy, the ability to hold a stable representation of a relationship even when that relationship is temporarily absent or contentious, is a third. All of these capacities develop through repeated, attuned relational experience. All of them are frequently impaired in people who later develop BPD.

Research in this area consistently points toward early environments characterized by emotional invalidation, neglect, trauma, or caregiving that was frightening rather than organizing. This does not mean every person with BPD experienced severe abuse — the research picture is more complicated than a simple trauma-to-diagnosis pipeline. What it does mean is that the early relational conditions that allow identity to consolidate were somehow absent, disrupted, or actively destabilizing. The self that forms under those conditions is adaptive to uncertainty. It learns to be permeable, to reorganize around the strongest signal in the room, to avoid committing to a fixed position that might be punished or ignored. That is a survival strategy. It is not a stable identity.

What often gets missed in popular accounts of BPD is that identity disturbance is not a character flaw or a refusal to grow up. It is the developmental legacy of an environment that did not provide the scaffolding identity requires. The behavior that results — the chameleon-like social adaptation, the sudden reversals, the fierce and fragile assertions of self followed by complete collapse — is not manipulation or drama. It is what identity looks like when it never had safe ground to stand on.

What Better Understanding Might Change

The Barcelona review does not offer a resolution. What it offers, usefully, is a clear map of where the field is lost. It calls for a more unified theoretical framework for identity disturbance in BPD, for validated measures that capture its multiple dimensions with some consistency, and for treatment research that tracks identity-specific outcomes rather than subsuming them under general symptom reduction.

“The symptom reduction is real and meaningful — but the emptiness remains, and when patients try to name it in session, the language is often thin.”

There are promising directions. The Alternative Model of Personality Disorders^[1] introduced in DSM-5's Section III places self-functioning — including identity — at the center of personality pathology rather than treating it as one criterion among nine. This framework, which has influenced ICD-11's approach to personality disorder classification, makes identity and interpersonal functioning the core organizing dimensions, with specific traits as additional specifiers. If it gains wider clinical uptake, it could shift how practitioners conceptualize BPD in ways that put identity disturbance closer to the center of treatment planning rather than the periphery.

Neurobiological research is also beginning to look more closely at the self-representational systems implicated in identity disturbance — particularly default mode network activity, which is involved in self-referential processing, autobiographical memory, and the construction of a continuous self-narrative. Early findings suggest meaningful differences in BPD, though the research is not yet at a stage that translates cleanly into clinical intervention.

What would change, concretely, if the field developed better tools? People with BPD would be more likely to have this specific feature named and tracked in their treatment. Therapists would have clearer targets for interventions aimed at identity consolidation, not just behavioral stabilization. And people sitting with that particular kind of blankness — the one that is not quite depression, not quite dissociation, not quite loneliness, but that hovers beneath all three — would have a better chance of hearing a clinician say: yes, we see that, we have language for it, and this is what we know about why it is there.

That may sound like a small thing. For someone whose core experience of their disorder is that the most destabilizing part of it keeps slipping past language, it is not small at all. Being accurately seen, in clinical settings as much as anywhere else, is not incidental to treatment. For people whose identity never had reliable ground, it may be where treatment actually begins.

References

1. An Overview of the DSM-5 Alternative Model of Personality Disorders (pmc.ncbi.nlm.nih.gov)
2. Efficacy of dialectical behavior therapy for adolescent self-harm and suicidal ideation: a systematic review and meta-analysis (pmc.ncbi.nlm.nih.gov)
   Provides evidence that dialectical behavior therapy reduces self-harm, suicidality, and crisis episodes in BPD, supporting the article's claim about DBT's efficacy for behavioral symptoms.
3. Identity Disturbance in Borderline Personality Disorder: A Scoping Review (sciencedirect.com)
   Scoping review finding that identity disturbance in BPD lacks consensus on measurement methods, assessment tools, and whether to treat it as categorical or continuous.
4. Identity Disturbance in Borderline Personality Disorder: A Scoping Review Protocol (imrpress.com)
   2025 scoping review mapping the field's inconsistent definitions, measurements, and theoretical frameworks for identity disturbance in BPD.