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What Is Borderline
Personality Disorder?

This guide draws on NIMH’s guide to borderline personality disorder and NAMI’s overview of BPD.

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SIGNS AND ASSESSMENT

What patterns are associated with BPD?

Read a plain-language overview and learn what a professional assessment considers.

TREATMENT

What treatments are used?

Understand psychotherapy, medication limits, care planning, and questions to ask a provider.

RECOVERY

What can recovery involve?

Explore realistic goals, setbacks, support, and ways to track progress without invented stories.

Read about recovery

Understanding BPD: What It Can Affect & How Support Helps

What the site provides

The pattern and intensity differ between people and can change over time. Areas that may be affected include:

  • regulating intense or rapidly changing emotions
  • maintaining a stable sense of self
  • navigating closeness, conflict, or fear of abandonment
  • managing impulsive actions during distress
  • coping with emptiness, anger, dissociation, self-harm, or suicidal thoughts
  • If you're struggling right now, get crisis support.

These experiences can overlap with trauma, mood, anxiety, substance-use, neurodevelopmental, and other conditions. Context matters. See how BPD differs from bipolar disorder.

What professional help adds

A clinician can explore how long patterns have lasted, how they affect daily life, other possible explanations, current safety, strengths, and support needs. Treatment is usually planned collaboratively.

Psychotherapy is the primary treatment described by NIMH. NICE advises comprehensive assessment, an agreed care plan, and a crisis plan when appropriate.

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  • Questions

Before you start

What is a person with borderline personality disorder like?
Everyone is different, but common experiences include intense emotions that shift quickly, a strong fear of being left, relationships that swing between closeness and conflict, and an unstable sense of who they are. Many people with BPD are also caring, perceptive and deeply sensitive to others.

Common triggers involve perceived rejection, criticism, separation or abandonment, such as a delayed reply, a change of plans or a disagreement. Triggers are personal, and therapies like DBT help people recognize theirs and respond differently.

The exact cause is unknown. Research points to a mix of family history, differences in brain areas that regulate emotions and impulses, and difficult experiences such as childhood trauma, neglect or unstable relationships. Having risk factors doesn’t mean someone will develop BPD.
They’re different conditions. Dissociative identity disorder involves two or more distinct identity states and gaps in memory. BPD can include brief, stress-related dissociation and an unstable sense of self, but not separate identities. Only a professional can tell them apart.
BPD patterns usually begin by early adulthood, but some people aren’t diagnosed until later because their symptoms were missed or mistaken for something else. Sudden new changes in mood or behavior later in life should be checked by a doctor, as other conditions can be the cause.