Key facts
- A personality disorder is a lasting pattern of thinking, feeling, and behaving that differs from cultural expectations and causes distress or impairment.
- The DSM-5 describes ten personality disorders, grouped into three clusters (A, B, and C).
- Patterns usually become recognizable in adolescence or early adulthood.
- Psychotherapy is the main treatment, and approaches such as DBT and schema therapy help many people improve.
What are personality disorders?
A personality disorder is a mental health condition defined by an enduring pattern of inner experience and behavior that differs markedly from what a person's culture expects. This pattern is pervasive across situations, stable over time, and leads to distress or problems in relationships, work, and daily life. It typically touches how a person thinks about themselves and others, how they feel and regulate emotion, how they relate to people, and how they control impulses.
These patterns usually take shape by adolescence or early adulthood and tend to feel like part of who the person is, which can make them hard to recognize from the inside. As the Mayo Clinic explains, a personality disorder is diagnosed only when these traits are inflexible and cause significant difficulty, not when someone simply has a strong or unusual personality.
Clinicians diagnose personality disorders using the criteria in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), published by the American Psychiatric Association. A diagnosis depends on a long-standing, pervasive pattern that deviates from cultural norms in areas such as cognition, emotion, interpersonal functioning, and impulse control, and that causes meaningful distress or impairment, after other causes are ruled out. This page paraphrases that framework in plain language; only a qualified professional can make an actual diagnosis. It is also worth noting that personality disorders often co-occur with mood disorders, anxiety, and substance use.
Types and clusters
The DSM-5 organizes ten personality disorders into three clusters based on shared features.
Cluster A (odd or eccentric):
- Paranoid: pervasive distrust and suspicion of others.
- Schizoid: detachment from relationships and limited emotional expression.
- Schizotypal: discomfort with closeness, eccentric behavior, and unusual beliefs or perceptions.
Cluster B (dramatic, emotional, or erratic):
- Borderline: instability in emotions, self-image, and relationships, with fear of abandonment and impulsivity.
- Narcissistic: a pattern of grandiosity, need for admiration, and difficulty with empathy.
- Antisocial: disregard for the rights of others and for social rules.
- Histrionic: excessive emotionality and attention seeking.
Cluster C (anxious or fearful):
- Avoidant: social inhibition, feelings of inadequacy, and sensitivity to criticism.
- Dependent: an excessive need to be cared for and difficulty making decisions alone.
- Obsessive-compulsive personality disorder: preoccupation with order, perfectionism, and control (distinct from OCD).
Symptoms
Symptoms vary by type, but common threads run through many personality disorders:
- Difficulty forming or keeping stable relationships
- Rigid, recurring patterns of thinking and behavior
- Trouble managing emotions or impulses
- A self-image that is distorted, unstable, or excessively dependent on others
- Frequent conflict, misunderstanding, or distance in close relationships
- Difficulty understanding how one's behavior affects others
Because these patterns feel familiar and longstanding, people often seek help for a related concern, such as depression, anxiety, or relationship breakdown, rather than for the personality disorder itself. A skilled clinician can identify the underlying pattern and tailor treatment accordingly.
Causes and risk factors
There is no single cause. Personality disorders usually develop from a combination of factors that shape personality over time:
- Genetics: a family history of personality disorders or other mental health conditions raises risk.
- Temperament: inborn differences in how a person reacts to the world.
- Early environment: childhood trauma, abuse, neglect, or unstable, unpredictable caregiving.
- Life experience: ongoing stress or invalidating relationships during formative years.
These influences interact. Borderline personality disorder, for example, is linked to a combination of genetic vulnerability and adverse early experiences. Importantly, having risk factors does not make a personality disorder inevitable, and understanding them helps guide effective, compassionate treatment.
How personality disorders are treated
Psychotherapy is the cornerstone of treatment, and the outlook is far more hopeful than it once was. Specialized, structured therapies help many people reduce symptoms, manage emotions, and build healthier relationships.
Dialectical behavior therapy (DBT)
Developed for borderline personality disorder, DBT teaches concrete skills in four areas: mindfulness, distress tolerance, emotion regulation, and interpersonal effectiveness. It has strong evidence for reducing self-harm, emotional instability, and crisis behavior.
Schema therapy
Schema therapy combines elements of cognitive, behavioral, and attachment-based approaches to identify and change deep-rooted patterns (schemas) formed early in life. It is used across several personality disorders and aims for lasting change in self-image and relationships.
Other psychotherapies and medication
Mentalization-based therapy, transference-focused therapy, and standard cognitive behavioral therapy also help, depending on the diagnosis and the person. No medication treats a personality disorder directly, but a prescriber may use medication to address co-occurring depression, anxiety, or other symptoms. Treatment usually takes time and consistency, and progress is real and worth it.
When to seek help
Reach out to a mental health professional if long-standing patterns in how you think, feel, or relate to others are causing repeated distress, conflict, or difficulty at work or in relationships. Seek help right away if you are struggling with self-harm or thoughts of suicide. A clinician experienced with personality disorders can assess what is happening and connect you with the right form of therapy. Help is available, and meaningful change is possible.
Frequently asked questions
Can a personality disorder be treated?
Yes. While personality disorders were once thought to be fixed, evidence now shows that psychotherapy helps many people. Approaches like dialectical behavior therapy and schema therapy reduce symptoms and improve relationships and quality of life over time.
What causes a personality disorder?
There is no single cause. Personality disorders usually develop from a mix of genetics, temperament, and early life experiences, including trauma, neglect, or unstable relationships during childhood and adolescence.
Is a personality disorder the same as having a difficult personality?
No. A personality disorder is a recognized mental health condition with an enduring pattern of inner experience and behavior that causes real distress and impairment. It is not simply being difficult, and it is not a character judgment.
Related conditions
Therapists who specialize in personality disorders
Connect with a licensed therapist on Psychology.com who works with personality disorders.
- Advance Thru Psychotherapy and Family Development
- Amanda P Bailey
- Arlyn P. Stern LCSW
- Asktheinternettherapist.com
- Beth Britton
- Candice Edelbaum
References
- National Institute of Mental Health (NIMH): Personality Disorders statistics
- Mayo Clinic: Personality disorders
- American Psychiatric Association (APA): What are personality disorders?
- NHS: Personality disorder
- Cleveland Clinic: Personality disorders overview
- MedlinePlus: Personality disorders