Borderline Personality Disorder (BPD): Symptoms, Causes, Diagnosis and Treatment
Borderline Personality Disorder (BPD) is a mental health condition that can affect emotions, self-image, relationships, impulses, and day-to-day functioning. People with BPD may experience intense emotions, sensitivity to rejection or abandonment, unstable relationships, changes in their sense of identity, impulsive behavior, feelings of emptiness, anger, or episodes of self-harm.
BPD is a recognized psychiatric condition, not a character flaw or simply a description of being "moody." Symptoms can vary considerably from person to person, and having one or two features associated with BPD does not mean that someone has the disorder. Diagnosis requires an assessment by a qualified mental health professional.
Importantly, BPD is treatable. Evidence-based psychotherapies can help many people reduce symptoms, improve functioning, and develop more stable and fulfilling lives. Recovery can occur, although the course varies between individuals and improvement may take time.
Quick Summary
| Topic | Key Information |
|---|---|
| Condition | Borderline Personality Disorder (BPD) |
| Common Features | Emotional instability, relationship difficulties, unstable self-image, impulsivity and sensitivity to abandonment |
| Typical Onset | Symptoms commonly emerge during adolescence or early adulthood, although diagnosis and recognition can occur at different ages |
| Causes | No single cause; biological, genetic, psychological and environmental factors may interact |
| Main Treatment | Structured psychotherapy is the primary treatment |
| DBT | Dialectical Behavior Therapy is one established psychotherapy used for BPD |
| Medication | Not a primary treatment for the core features of BPD; may sometimes be used for specific symptoms or co-occurring conditions |
| Outlook | Many people experience substantial improvement with appropriate care and support |
| Urgent Warning Signs | Suicidal thoughts, self-harm, serious injury, or immediate danger require prompt professional or emergency help |
What Is Borderline Personality Disorder?
Borderline Personality Disorder is a mental health condition involving persistent difficulties with emotional regulation, self-image, relationships, and impulse control. A person may experience emotions very intensely and may have difficulty returning to an emotional baseline after stressful or interpersonal events.
BPD can also involve a strong sensitivity to perceived rejection or abandonment. Relationships may become emotionally intense, and a person's view of themselves or other people can change rapidly during periods of distress.
The symptoms are not identical in everyone. Their frequency, severity and impact on daily life can vary substantially.
BPD can interfere with relationships, education, employment, physical health, and overall quality of life. However, the diagnosis does not define a person's character, abilities, or future.
Common Symptoms of BPD
Symptoms of BPD can overlap with other mental health conditions. For that reason, individual symptoms should not be used to self-diagnose the disorder.
1. Fear of Abandonment
A person with BPD may experience intense fear of being rejected, abandoned, or left alone. This fear can involve either actual separation or situations that are interpreted as possible rejection.
For example, a delayed response to a message, a canceled plan, or a perceived change in someone's feelings may trigger significant emotional distress in some people.
This does not mean that every strong reaction to rejection indicates BPD. The broader pattern of symptoms and its impact on functioning must be considered.
2. Unstable or Intense Relationships
Relationships may become particularly intense or difficult to maintain. A person may alternate between feeling extremely close to someone and later feeling deeply disappointed, rejected, angry, or betrayed.
This pattern can create conflict and emotional distress for everyone involved. It should not automatically be interpreted as manipulation or intentional behavior.
3. Changes in Self-Image or Sense of Identity
BPD can involve an unstable or changing sense of self. Some people may be uncertain about who they are, what they value, or what they want from life.
Possible experiences include:
- Unstable self-esteem
- Uncertainty about identity
- Rapidly changing goals or plans
- Feeling disconnected from one's sense of self
- Difficulty maintaining a consistent view of personal values or future direction
4. Intense and Rapidly Changing Emotions
Emotional reactions in BPD can be intense and may change relatively quickly. NIMH notes that mood episodes associated with BPD may last from a few hours to a few days.
Possible emotional experiences include:
- Intense sadness
- Anxiety or fear
- Irritability
- Anger
- Emotional emptiness
- Feeling overwhelmed
BPD should not be reduced to ordinary "mood swings." Emotional instability occurs as part of a broader pattern involving relationships, self-image, impulsivity and emotional regulation.
5. Impulsive or Risky Behavior
Some people with BPD experience impulsivity, particularly during periods of emotional distress.
Examples can include:
- Reckless spending
- Unsafe sexual behavior
- Substance use
- Dangerous driving
- Binge eating
- Other actions taken without fully considering the consequences
These behaviors can also occur in other psychiatric conditions. A clinician therefore considers the overall pattern rather than treating one behavior as evidence of BPD.
6. Chronic Feelings of Emptiness
Some people with BPD experience persistent feelings of emptiness or an internal sense that something is missing.
This may be described as:
- Emotional emptiness
- Numbness
- Lack of purpose
- Feeling disconnected from oneself
- A sense of inner void
7. Intense Anger
Intense anger or difficulty controlling anger can occur in BPD. Anger may appear as irritability, verbal outbursts, resentment, or other strong reactions.
Not everyone with BPD experiences anger in the same way. Some people may instead direct intense emotions inward or experience shame and distress after an emotional episode.
8. Self-Harm and Suicidal Thoughts or Behavior
Self-harm and suicidal thoughts or behaviors are important safety concerns associated with BPD. NIMH reports substantially higher rates of self-harm and suicidal thoughts and behaviors among people with BPD compared with the general population.
Self-harm can include deliberately injuring oneself in different ways. It should always be taken seriously and should not be dismissed as attention-seeking behavior.
If someone is thinking about suicide, has seriously injured themselves, or is in immediate danger, seek urgent professional or emergency assistance rather than attempting to manage the situation through an online article.
9. Dissociation and Stress-Related Suspiciousness
During periods of intense stress, some people with BPD may experience dissociation or temporary suspicious or paranoid thoughts.
Dissociation may involve:
- Feeling detached from oneself
- Feeling disconnected from surroundings
- Feeling as though one is observing oneself from outside the body
- Emotional numbness
These experiences can also occur in other mental health conditions, so professional assessment is important.
Why BPD Is Often Misunderstood
BPD has historically been associated with considerable stigma. People with the condition may incorrectly be described as manipulative, attention-seeking, dramatic, difficult, or incapable of maintaining relationships.
These labels can be harmful. BPD involves genuine psychological distress and difficulties with emotional regulation, relationships, self-image and behavior.
A diagnosis does not tell you whether a person is kind, trustworthy, intelligent, responsible, or capable of recovery. It describes a pattern of mental health symptoms that can be treated.
Reducing stigma is particularly important because fear of judgment can make it harder for people to seek or continue appropriate care.
What Causes Borderline Personality Disorder?
There is no single known cause of BPD. Current understanding suggests that multiple biological, genetic, psychological and environmental factors may interact.
Genetic and Biological Vulnerability
Research suggests that inherited characteristics may contribute to vulnerability to BPD. Genetics, however, do not determine whether a person will develop the disorder.
Researchers are also studying differences in brain systems involved in emotional regulation, impulse control and responses to stress. These findings are part of ongoing research and should not be interpreted as meaning that BPD is simply caused by a particular brain abnormality.
Environmental and Psychological Factors
Some people with BPD report difficult childhood or life experiences, including neglect, abuse, unstable caregiving, family conflict, or other forms of adversity.
However, trauma should not be presented as a simple cause of BPD. Not everyone who experiences trauma develops BPD, and not everyone with BPD reports trauma.
A more accurate explanation is that environmental experiences may interact with individual biological and psychological vulnerabilities.
How BPD Can Affect Daily Life
The impact of BPD varies considerably. Some people experience substantial difficulties in several areas, while others maintain important relationships, employment, education, or other aspects of daily functioning.
Relationships
Fear of abandonment, emotional sensitivity and difficulty regulating intense feelings can contribute to relationship conflict or instability.
Work and Education
Emotional distress, impulsivity, difficulty concentrating, or relationship problems may interfere with work or education for some individuals.
Emotional Well-Being
Living with intense and rapidly changing emotions can be exhausting. People may also experience shame, anxiety, depression, isolation, or hopelessness, particularly when symptoms are untreated.
Other Conditions That May Occur Alongside BPD
BPD can occur alongside other mental health conditions. NIMH identifies depression, post-traumatic stress disorder, bipolar disorder, anxiety disorders, substance use disorders and eating disorders among conditions that may overlap or co-occur with BPD.
These overlapping symptoms can make diagnosis more complicated. A comprehensive assessment is therefore important.
| Condition | Why Assessment Matters |
|---|---|
| Depression | Low mood and hopelessness may occur with BPD or as a separate condition. |
| Anxiety disorders | Fear and anxiety can overlap with emotional distress associated with BPD. |
| PTSD | Trauma-related symptoms can overlap with some BPD experiences. |
| Bipolar disorder | Both conditions can involve changes in mood, but their diagnostic patterns are different. |
| Substance use disorders | Substance use may occur alongside BPD and can complicate treatment and safety. |
| Eating disorders | Impulsive eating or other eating-related symptoms may occur alongside BPD. |
BPD vs Bipolar Disorder
BPD and bipolar disorder are different mental health conditions, although some symptoms can appear similar.
One important distinction is the pattern of mood changes. Bipolar disorder involves distinct episodes of mania or hypomania, depending on the type of bipolar disorder. BPD is characterized by a broader pattern of emotional instability, relationship difficulties, changes in self-image, impulsivity and sensitivity to abandonment.
NIMH notes that impulsive behavior can occur in both conditions, which is one reason professional assessment is important.
It is not appropriate to diagnose either condition based only on an online checklist.
How Is Borderline Personality Disorder Diagnosed?
BPD should be diagnosed by a qualified mental health professional rather than through an internet quiz or symptom checklist.
Clinical Interview
A clinician may ask about:
- Current symptoms
- Emotional experiences
- Relationships
- Impulsive behavior
- Self-harm or suicidal thoughts
- Personal history
- Family and mental health history
- How symptoms affect work, education and everyday functioning
Considering Other Conditions
The clinician may also consider other explanations for the symptoms, including mood disorders, anxiety disorders, trauma-related conditions, substance use and physical health conditions.
This is important because some symptoms overlap across different conditions.
Diagnosis Is More Than Counting Symptoms
Having fear of abandonment, mood changes, anger or impulsive behavior does not automatically mean a person has BPD.
The overall pattern, duration, severity, context and effect on functioning must be considered by an appropriately trained professional.
Evidence-Based Treatment for BPD
Psychotherapy is the primary treatment for BPD. Evidence-based treatments can help many people experience fewer or less severe symptoms and improve functioning and quality of life.
The American Psychiatric Association's current 2025 guideline recommends a structured psychotherapy approach that targets the core features of BPD and is tailored to the person's needs, preferences and circumstances.
Dialectical Behavior Therapy (DBT)
Dialectical Behavior Therapy was developed specifically for people with BPD. It teaches practical skills for managing intense emotions, tolerating distress, improving relationships and increasing awareness of thoughts and feelings.
Common DBT skill areas include:
| Skill Area | Purpose |
|---|---|
| Mindfulness | Developing greater awareness of thoughts, feelings and the present moment |
| Emotion regulation | Learning skills for understanding and managing intense emotions |
| Distress tolerance | Developing safer ways to cope with difficult emotional situations |
| Interpersonal effectiveness | Improving communication, boundaries and relationships |
DBT is an established treatment option, but it should not be described as the universally "best" treatment for every person with BPD. Treatment should be individualized.
Cognitive Behavioral Therapy (CBT)
CBT can help people identify unhelpful patterns of thinking and behavior and develop alternative ways of responding to difficult situations.
It may be used as part of an individualized treatment plan, depending on the person's symptoms and clinical needs.
Mentalization-Based Therapy and Other Approaches
Other structured psychological approaches may also be used. Mentalization-based approaches focus on improving the ability to understand one's own mental state and consider the thoughts and feelings of other people.
The most appropriate approach depends on the person's symptoms, preferences, treatment availability and professional assessment.
Medication for BPD
Medication is not a primary treatment for the core features of BPD. The benefits of medication specifically for BPD are less clear than the evidence for psychotherapy.
A psychiatrist or other qualified healthcare professional may sometimes prescribe medication as an adjunct to psychotherapy to address particular symptoms or co-occurring conditions.
Medication decisions should be individualized. People should not start, stop, combine or change psychiatric medicines without discussing the decision with their healthcare professional.
NICE guidance also advises against using medication specifically as a treatment for BPD or its individual symptoms and recommends considering medication primarily in relation to co-occurring conditions where appropriate.
Can BPD Improve Over Time?
Yes. BPD does not necessarily remain equally severe throughout a person's life.
Many people experience substantial improvement in symptoms and functioning over time, particularly when they receive appropriate treatment and support. However, the course is different for each person, and improvement should not be presented as guaranteed or tied to a specific timeline.
Recovery may involve improvements in:
- Emotional regulation
- Relationship stability
- Impulse control
- Self-understanding
- Ability to manage stressful situations
- Quality of life
Recovery does not necessarily mean that every symptom disappears permanently. For some people, ongoing support may remain useful.
Practical Strategies That Can Support Treatment
Lifestyle habits do not replace psychotherapy or professional care for BPD. However, healthy routines can support overall well-being and may make it easier to use coping skills learned in treatment.
Maintain a Regular Routine
A predictable daily routine can provide structure. Sleep, meals, work, education and personal activities can be organized around a schedule that is realistic for the individual.
Practice Skills Learned in Therapy
If a therapist has taught specific emotional-regulation, grounding or distress-tolerance techniques, practicing those skills outside therapy may help reinforce them.
Recognize Emotional Triggers
Keeping a private record of situations, thoughts, emotions and responses may help a person and their therapist identify recurring patterns.
Use Grounding Strategies
Depending on the person's treatment plan, grounding may include paying attention to sensory information, slowing down before responding, mindful breathing, or focusing attention on the immediate environment.
These techniques should be considered coping tools rather than treatments that cure BPD.
Limit Harmful Coping Behaviors
Alcohol and recreational drugs can complicate emotional regulation and treatment. If substance use is becoming difficult to control, professional support can help.
Build Supportive Relationships
Supportive relationships can be valuable, but family members and friends should not be expected to provide professional treatment. Families and caregivers may also benefit from education, counseling or their own support.
How Family and Friends Can Help
Supporting someone with BPD can sometimes be emotionally demanding. Helpful support should be compassionate while also respecting appropriate boundaries.
- Listen without immediately judging or dismissing the person's feelings.
- Encourage professional treatment rather than attempting to become the person's therapist.
- Take statements about suicide or self-harm seriously.
- Encourage the person to follow their agreed treatment plan.
- Learn about BPD from reliable health sources.
- Maintain reasonable personal boundaries.
- Seek professional support for yourself if caregiving becomes overwhelming.
NICE recommends care that is collaborative, respectful and optimistic, while also emphasizing appropriate assessment and management of self-harm and crises.
Myths and Facts About BPD
| Myth | Fact |
|---|---|
| BPD is simply moodiness. | BPD involves a broader pattern of emotional, interpersonal, self-image and behavioral difficulties. |
| Everyone with BPD is manipulative. | Stigma-based labels are not an appropriate way to understand a psychiatric condition. |
| Trauma always causes BPD. | Trauma may be a contributing factor for some people, but BPD does not have one single cause. |
| BPD cannot improve. | Many people experience substantial improvement in symptoms and functioning. |
| Medication cures BPD. | Medication is not a primary treatment for the core features of BPD. |
| DBT is the only effective therapy. | DBT is an established approach, but other structured psychotherapies may also be appropriate. |
| A symptom checklist can diagnose BPD. | Diagnosis requires professional assessment and consideration of other conditions. |
When Should Someone Seek Professional Help?
Consider speaking with a qualified mental health professional when emotional or behavioral difficulties are persistent, severe, or interfering with relationships, work, education or daily life.
Professional assessment is particularly important when someone experiences:
- Repeated self-harm
- Suicidal thoughts or behavior
- Severe emotional instability
- Persistent relationship difficulties
- Significant impulsive or risky behavior
- Substance misuse
- Episodes of dissociation or severe suspiciousness
- Symptoms of depression, anxiety, trauma or another mental health condition
What to Do During a Mental Health Crisis
A mental health crisis requires a different approach from routine self-management.
If someone is at immediate risk of suicide, has seriously harmed themselves, has taken an overdose, is experiencing a severe psychiatric crisis, or may harm themselves or another person, seek emergency medical assistance immediately.
Do not leave a person at immediate risk alone if doing so would place them in greater danger. Contact local emergency services or go to the nearest emergency department.
For people in India, emergency assistance can be sought through 112. Mental-health support may also be available through the Government of India's Tele-MANAS service at 14416 or 1-800-891-4416. Availability and service details can change, so verify current information through official government sources.
If the situation is not immediately life-threatening but is worsening, contact the person's psychiatrist, psychologist, doctor, mental-health service, or other established care team as soon as possible.
Frequently Asked Questions About BPD
What are the main symptoms of BPD?
Common features include intense emotional reactions, fear of abandonment, unstable or intense relationships, an unstable sense of self, impulsive behavior, chronic feelings of emptiness, intense anger, self-harm, suicidal thoughts or behavior, and stress-related dissociation in some people.
Is BPD the same as bipolar disorder?
No. They are different psychiatric conditions. Some symptoms can overlap, but bipolar disorder involves distinct episodes of mania or hypomania, whereas BPD involves a broader pattern of emotional, interpersonal, self-image and behavioral difficulties.
Can BPD be cured?
The word "cure" can be misleading for a complex mental health condition. BPD is treatable, and many people experience substantial improvement in symptoms and functioning. Some people may continue to need support over time.
Is BPD genetic?
Genetic factors may contribute to vulnerability, but genetics alone do not determine whether someone develops BPD. Environmental and psychological factors may also play a role.
Does trauma cause BPD?
Traumatic or adverse experiences may contribute to vulnerability in some people, but trauma is not a simple or universal cause of BPD. People can develop BPD without a known history of trauma, and many people who experience trauma do not develop BPD.
Is DBT effective for BPD?
DBT is an established structured psychotherapy for BPD and was specifically developed for people experiencing severe emotional dysregulation and related difficulties. It teaches skills involving mindfulness, distress tolerance, emotional regulation and interpersonal effectiveness.
Does everyone with BPD self-harm?
No. Self-harm is an important risk associated with BPD, but not everyone with the condition self-harms. Conversely, self-harm can occur in people who do not have BPD.
How long does BPD treatment take?
There is no single treatment duration that applies to everyone. Treatment depends on symptoms, risk, co-occurring conditions, treatment approach, personal circumstances and response to therapy. A clinician can help determine an appropriate treatment plan.
Can people with BPD have healthy relationships?
Yes. Relationship difficulties can be an important part of BPD, but they do not mean that healthy relationships are impossible. Treatment can help people develop emotional-regulation, communication and interpersonal skills.
Can lifestyle changes treat BPD?
Healthy sleep, physical activity, regular routines, supportive relationships and limiting harmful substance use can support general well-being. They should not, however, be presented as replacements for evidence-based psychological treatment.
Key Takeaways
- Borderline Personality Disorder is a recognized mental health condition affecting emotions, relationships, self-image and behavior.
- Symptoms vary considerably between individuals.
- Fear of abandonment, unstable relationships, identity disturbance, emotional instability and impulsivity are among the commonly recognized features.
- Self-harm and suicidal behavior are important safety concerns and should always be taken seriously.
- BPD does not have one single known cause.
- Genetic, biological, psychological and environmental factors may interact.
- Trauma may contribute to vulnerability for some people but should not be described as the universal cause of BPD.
- Diagnosis requires assessment by a qualified mental health professional.
- Psychotherapy is the primary treatment for BPD.
- DBT is an established treatment approach, but it is not appropriate to claim that one therapy is universally best for everyone.
- Medication is not a primary treatment for the core features of BPD but may sometimes be used for specific symptoms or co-occurring conditions.
- Many people experience meaningful improvement over time with appropriate treatment and support.
For more information about mental health and emotional well-being, read our guide to mental health and emotional well-being. You can also learn about anger management and emotional regulation and explore our guide to healthy sleep. For information about stress and its effects on emotional health, see our guide to stress management.
Conclusion
Borderline Personality Disorder is a complex mental health condition that can affect emotions, relationships, identity, impulses and everyday functioning. Its symptoms can be distressing, but they should not be interpreted as evidence of a person's character or worth.
BPD does not have one simple cause. Research points to interactions among biological vulnerability, genetics, psychological processes and environmental experiences. Trauma may be relevant for some people, but it should not be presented as a universal explanation.
Professional assessment is important because BPD can overlap with depression, anxiety disorders, PTSD, bipolar disorder, substance use disorders and other conditions. Treatment should therefore be individualized.
Psychotherapy remains the primary treatment. DBT is one established approach, while other structured psychotherapies may also be appropriate. Medication may have a supporting role in selected circumstances, particularly when treating specific symptoms or co-occurring conditions.
Most importantly, BPD is not synonymous with hopelessness. Many people experience meaningful improvement over time. With appropriate treatment, support, and a respectful approach to mental health care, people living with BPD can work toward greater emotional stability, healthier relationships and improved quality of life.
Medical Disclaimer
This article is for general educational and informational purposes only. It does not provide a diagnosis and should not replace assessment, treatment or advice from a qualified psychiatrist, psychologist, physician or other licensed healthcare professional.
Do not use an online symptom list to diagnose yourself or another person with Borderline Personality Disorder. If you or someone you know is experiencing suicidal thoughts, self-harm, serious emotional distress, or immediate danger, seek urgent professional or emergency assistance.
Trusted Medical and Clinical Resources
- National Institute of Mental Health (NIMH) – Borderline Personality Disorder – Information about BPD symptoms, diagnosis, treatment and finding help.
- American Psychiatric Association – Borderline Personality Disorder Guideline – Current clinical guidance on evidence-based treatment for BPD.
- MedlinePlus – Borderline Personality Disorder – Trusted patient information about BPD symptoms, causes, diagnosis and treatment.
- NICE – Borderline Personality Disorder: Recognition and Management – Clinical recommendations covering assessment, psychological treatment, medication and crisis management.
- NICE – Self-Harm: Assessment, Management and Preventing Recurrence – Guidance on assessment and support for people who self-harm.
