Last Updated on October 1, 2026
Borderline personality disorder is often discussed online through labels such as “toxic,” “manipulative,” or “emotionally unstable.” Those descriptions are not only unhelpful; they can make a complex and treatable mental health condition much harder to understand.
Borderline personality disorder (BPD) is a recognised mental health condition that can affect how a person experiences emotions, sees themselves, handles close relationships, and responds when distressed.
Someone with BPD may experience emotions very intensely, struggle with fears of rejection or abandonment, have an unstable sense of themselves, or behave impulsively when overwhelmed. But BPD does not look the same in everyone, and having one or two of these experiences does not mean a person has the disorder.
Most importantly, BPD is treatable. Symptoms can improve substantially with appropriate psychological treatment. National Institute of Mental Health
What Is Borderline Personality Disorder?
BPD belongs to the broader group of personality disorders, but the word “personality” can be misleading for someone hearing the diagnosis for the first time.
It does not mean there is something fundamentally wrong with a person’s personality.
Clinically, BPD describes a persistent pattern involving difficulties in several areas, particularly:
- regulating strong emotions
- maintaining a stable sense of self
- managing closeness, rejection and conflict in relationships
- controlling impulses when distressed
Other features can include feelings of emptiness, intense anger, fear of abandonment, self-harm or suicidal behaviour in some people, and temporary dissociation or suspicious thinking during severe stress.
A person does not need to experience every possible feature of BPD. This is one reason two people with the same diagnosis may seem very different from one another.
9 Signs and Symptoms of Borderline Personality Disorder
BPD cannot be recognised from one argument, one difficult relationship, or one episode of impulsive behaviour. Clinicians look for a broader pattern that has persisted over time and is causing significant distress or difficulty in everyday functioning.
Possible features include the following.
1. Strong Fear of Abandonment
Someone may become intensely distressed by the possibility that an important person could leave, reject them, or become emotionally unavailable.
Triggers may include a breakup, an argument, a delayed response, a partner asking for space, or feeling excluded by friends.
The emotional reaction can sometimes feel much larger than the immediate event because the situation is experienced as a threat to an important relationship.
Fear of abandonment by itself, however, does not mean someone has BPD.
2. Intense or Unstable Relationships
Close relationships may sometimes move rapidly between strong connection and deep disappointment.
A person might feel extremely close to someone and later feel badly hurt, rejected, or angry after a conflict or perceived betrayal.
Clinicians sometimes refer to shifts between idealisation and devaluation, but this should not be reduced to internet labels such as “love bombing” or “discarding.”
The experience is often connected to intense emotion and difficulty maintaining a balanced view of another person during moments of distress.
3. An Unstable Sense of Self
BPD can affect identity as well as relationships.
Someone may struggle with questions such as:
Who am I?
What do I actually want?
Why does the way I see myself change so much?
Goals, values, career plans, relationships, or feelings about oneself may sometimes change substantially.
This is different from simply having low confidence. The difficulty can involve a less stable sense of personal identity.
4. Impulsive Behaviour
Some people with BPD act quickly when emotionally overwhelmed, even when the behaviour may have serious consequences.
Impulsivity can occur in many mental health conditions, so it is never enough on its own to diagnose BPD.
A clinician needs to understand when the behaviour occurs, what triggers it, how persistent it is, and whether another condition could better explain it.
5. Rapid and Intense Emotional Changes
One of the central difficulties in BPD is emotion regulation.
Emotions may rise quickly and feel extremely powerful. Returning to a calmer emotional state can also be difficult.
A relatively small interpersonal event may sometimes trigger intense sadness, anxiety, anger, or shame.
This does not mean the emotions are fake or deliberately exaggerated. The person’s emotional system may genuinely be responding very strongly to what feels threatening or painful.
6. Persistent Feelings of Emptiness
Some people describe feeling hollow, disconnected, or as though something important is missing.
This can occur even when life appears relatively stable from the outside.
Chronic emptiness is different from occasionally feeling bored or lonely and may be particularly difficult for people to explain to others.
7. Difficulty Managing Anger
Strong anger can occur, particularly around perceived rejection, criticism, unfairness, or abandonment.
But BPD does not automatically make someone aggressive.
Some people express anger outwardly, while others turn it inward through intense self-criticism, shame, or self-destructive behaviour.
8. Self-Harm or Suicidal Behaviour
Recurrent self-harm, suicidal thoughts, or suicidal behaviour can occur in BPD, particularly during periods of severe emotional distress.
Not everyone with BPD self-harms, and self-harm can occur in many other mental health conditions.
Because these behaviours can be serious, they require proper clinical assessment rather than being treated simply as another “BPD sign.”
9. Dissociation or Suspicious Thoughts During Severe Stress
During periods of intense stress, some people may temporarily feel disconnected from themselves or their surroundings.
Others may become unusually suspicious about other people’s intentions.
These experiences are generally understood in the wider context of the person’s symptoms and should not automatically be interpreted as a chronic psychotic disorder.
What Causes Borderline Personality Disorder?
There is no single known cause of BPD.
Current research suggests that it develops through a combination of biological vulnerability, temperament, developmental experiences, and environmental or interpersonal factors.
Factors associated with increased risk can include:
- family history of BPD or other mental health conditions
- high emotional sensitivity
- childhood abuse or neglect
- abandonment or significant instability
- repeated interpersonal conflict
- difficult or invalidating relationship environments
- other adverse childhood or later life experiences
Trauma is common in the histories of many people with BPD, but it is important not to say that trauma always causes BPD.
Many people experience trauma without developing BPD, and not every person diagnosed with BPD reports severe childhood trauma.
Research has also identified differences in brain systems involved in emotion and impulse regulation, but scientists cannot simply say these brain differences “cause BPD.” They may represent risk factors, consequences of the disorder, or a combination of influences.
Is BPD the Same as Bipolar Disorder?
No.
BPD and bipolar disorder are separate conditions, although there can be overlap in symptoms such as impulsivity, irritability, and changes in mood.
A major distinction concerns the pattern of mood change.
In BPD, intense emotional shifts are often closely related to what is happening around the person, particularly interpersonal stress or perceived rejection.
Bipolar disorder involves distinct depressive, manic, or hypomanic episodes with broader changes in mood, energy, activity, and functioning.
It is possible for someone to have both conditions, which is why diagnosis should not be based on a symptom checklist alone.
Is BPD the Same as Complex PTSD?
No, although the two can overlap.
Both may involve:
- emotional dysregulation
- relationship difficulties
- negative feelings about oneself
- dissociation
- histories of trauma
Complex PTSD, however, is a trauma-related condition, while BPD involves a broader pattern that includes instability in identity, relationships, emotions, and behaviour.
Someone’s trauma history alone cannot tell a clinician which diagnosis is appropriate. Readers wanting to understand trauma-related symptoms separately can read about PTSD and complex PTSD.
Can BPD Occur With Depression, Anxiety or ADHD?
Yes.
BPD frequently occurs alongside other mental health conditions. These may include depression, anxiety disorders, PTSD, substance-use disorders, eating disorders, ADHD, and bipolar disorder.
This overlap is one reason proper assessment matters.
For example, impulsivity may occur in ADHD, bipolar disorder, and BPD for different reasons. Persistent low mood may reflect depression, BPD-related distress, or both.
A clinician looks at the whole pattern, rather than assigning a diagnosis from one symptom.
How Is Borderline Personality Disorder Diagnosed?
There is no blood test, brain scan, or simple online quiz that can diagnose BPD.
Diagnosis involves a detailed assessment by a qualified mental health professional.
The American Psychiatric Association recommends considering the person’s symptoms, treatment goals, physical and mental health, psychosocial circumstances, treatment history, mental state, and risk of suicide or self-injury as part of a thorough evaluation. American Psychiatric Association
A clinician may explore:
- how long the difficulties have been present
- whether they occur across different relationships or situations
- their effect on work, study, and daily functioning
- identity and relationship patterns
- emotional regulation
- impulsive behaviour
- trauma and developmental history
- other mental health conditions
- substance use
- current safety concerns
Clinical tools can support assessment, but they need professional interpretation. PsychiCare also provides professional psychological assessment using validated personality and mental health assessment tools.
A difficult breakup, intense relationship, fear of rejection, or episode of self-harm is not enough by itself to diagnose borderline personality disorder.
How Is Borderline Personality Disorder Treated?
Psychotherapy is the main treatment for BPD.
Current clinical guidelines recommend structured psychotherapy that targets the core difficulties associated with borderline personality disorder.
Several established approaches are used.
Dialectical Behaviour Therapy
Dialectical Behaviour Therapy, or DBT, was developed specifically for people experiencing severe emotional dysregulation and self-destructive behaviour.
DBT commonly works on:
- emotion regulation
- distress tolerance
- mindfulness
- interpersonal effectiveness
- reducing harmful or impulsive behaviours
Mentalization-Based Treatment
Mentalization-Based Treatment, or MBT, helps people better understand their own thoughts and feelings and interpret what may be happening in another person’s mind.
This can be particularly useful when intense emotion makes it difficult to interpret relationship situations accurately.
Schema Therapy and Other Structured Therapies
Schema therapy works with longstanding emotional patterns, beliefs about oneself and others, unmet emotional needs, and coping responses.
Transference-focused psychotherapy is another specialised approach used for BPD.
There is evidence supporting several structured psychotherapies, so treatment should not be presented as though only one therapy works for everyone.
The person’s needs, level of impairment, risks, preferences, and ability to engage in treatment all matter. The NICE guideline for borderline personality disorder provides detailed clinical recommendations on psychological treatment and ongoing care.
Do Medicines Treat BPD?
Medication is not considered the main treatment for the core features of BPD.
Clinical guidelines recommend that medication, when used, should have a clear purpose and should generally support rather than replace psychological treatment.
Medicines may sometimes be appropriate when a person also has another mental health condition that requires treatment.
For example, a psychiatrist may assess medication needs when depression, another mood disorder, or another psychiatric condition is also present.
Medication should therefore be considered within the person’s wider clinical picture rather than treated as a standard cure for BPD.
Can Someone Recover From Borderline Personality Disorder?
Yes.
One of the most damaging misconceptions about BPD is that people never improve.
Long-term research shows that many people experience substantial reductions in symptoms over time, although improvement in work, relationships, and wider social functioning can sometimes take longer.
A major clinical review published in World Psychiatry also concludes that BPD is treatable and that the longer-term course is often more favourable than older descriptions of the disorder suggested. World Psychiatry review
Recovery does not always happen evenly.
A person may stop meeting full diagnostic criteria while still needing time and support to rebuild:
- relationships
- education
- employment
- confidence
- daily routines
- social functioning
That distinction matters.
Treatment is not simply about removing a diagnostic label. It is about helping someone build a life in which emotions, relationships, and periods of distress become increasingly manageable.
When Should You Speak to a Psychologist?
Recognising yourself in a few BPD symptoms does not mean you should diagnose yourself.
Consider speaking with a mental health professional when emotional instability, relationship difficulties, fear of abandonment, impulsive behaviour, identity problems, or repeated crises are causing significant distress or interfering with everyday life.
Assessment can also be useful when previous diagnoses do not fully explain what you are experiencing.
A trained psychologist can distinguish BPD from conditions that may appear similar and recommend treatment based on the full clinical picture rather than an online label.
You can view PsychiCare’s team of experienced psychologists and mental health professionals if you would like to explore professional support.
If you are experiencing suicidal thoughts, have recently seriously harmed yourself, or feel unable to keep yourself safe, seek urgent local emergency or crisis support rather than waiting for a routine online therapy appointment.
Common Misconceptions About BPD
“People with BPD are manipulative.”
This is a stigmatising oversimplification. Behaviours that occur during intense distress need to be understood in their emotional and interpersonal context.
“BPD means having multiple personalities.”
No. Borderline personality disorder and dissociative identity disorder are different conditions.
“Everyone with BPD has childhood trauma.”
No. Trauma can be an important risk factor, but it is neither required nor sufficient for developing BPD.
“BPD and bipolar disorder are basically the same.”
They are separate diagnoses with important differences in their clinical patterns.
“People with BPD cannot have healthy relationships.”
A diagnosis does not determine the future of someone’s relationships.
“BPD cannot be treated.”
This is false. Evidence-based psychotherapy can significantly reduce symptoms and improve functioning.
Final Thoughts
Borderline personality disorder is more complex than being emotional, fearing abandonment, or having difficult relationships.
It involves a broader pattern affecting emotion regulation, identity, relationships, and behaviour, and the way those difficulties interact can be different for every person.
That is also why BPD should not be diagnosed casually—from a social-media video, an online checklist, or someone’s behaviour during one difficult relationship.
A proper clinical assessment looks at the whole person.
And receiving a diagnosis does not mean someone’s personality is permanently damaged. BPD is a treatable condition, and with structured psychological care, many people experience substantial improvement in both symptoms and everyday life.
