There are 10 officially recognized personality disorders, grouped into three clusters based on shared traits. This is the classification used by the DSM-5-TR, the diagnostic manual that guides mental health professionals in the United States and much of the world. Globally, about 7.8% of people meet the criteria for at least one personality disorder.
The Three Clusters
The 10 personality disorders fall into three groups. Cluster A includes disorders marked by odd or eccentric behavior. Cluster B covers dramatic, emotional, or erratic patterns. Cluster C involves anxiety and fear-driven behavior. Each cluster contains three or four specific disorders, and while the disorders within a cluster share a general flavor, they differ significantly in how they show up in a person’s life.
Cluster A: Odd or Eccentric
Cluster A contains three personality disorders tied together by patterns of suspicion, social withdrawal, or unusual thinking.
Paranoid personality disorder centers on deep, persistent mistrust. A person with this disorder assumes others are out to harm or deceive them, holds grudges over perceived slights, and may suspect a partner of cheating without any evidence. The suspicion isn’t tied to a specific event; it colors nearly every relationship.
Schizoid personality disorder looks like emotional detachment. People with this pattern consistently prefer being alone, show little interest in close relationships or sexual intimacy, and appear indifferent to praise or criticism. They often seem cold or flat, though the experience from the inside may simply be one of not feeling drawn to social connection.
Schizotypal personality disorder involves eccentric beliefs and behavior alongside social discomfort. Someone with this disorder might engage in “magical thinking,” believing their thoughts can directly influence events, or perceive hidden messages in ordinary situations. They often experience intense social anxiety that doesn’t improve with familiarity.
Cluster B: Dramatic or Erratic
Cluster B includes four disorders linked by emotional intensity, impulsiveness, and difficulty maintaining stable relationships. These are the personality disorders most people have heard of.
Antisocial personality disorder involves a pattern of disregarding and violating the rights of others. People with this disorder often manipulate or deceive for personal gain and show little remorse. It can only be diagnosed in adults, though the pattern typically begins in adolescence.
Borderline personality disorder (BPD) is defined by emotional instability, a chronic sense of inner emptiness, and intense but unstable relationships. Mood swings can be rapid and severe, and impulsive behaviors like reckless spending or substance use are common. BPD has historically been diagnosed about three times more often in women than in men, though research suggests men with BPD are frequently underdiagnosed. Their symptoms may be attributed to antisocial personality disorder instead, since the two can look similar on the surface.
Histrionic personality disorder revolves around an overwhelming need for attention. People with this pattern tend to be easily influenced by others, have rapidly shifting emotions, and may use their appearance or dramatic behavior to keep themselves at the center of social situations.
Narcissistic personality disorder involves an inflated sense of self-importance, a deep need for admiration, and a lack of empathy. Behind the grandiosity, self-esteem is often fragile and heavily dependent on external validation.
Cluster C: Anxious or Fearful
Cluster C contains three disorders driven by anxiety, fear, or a need for control.
Avoidant personality disorder is marked by chronic feelings of inadequacy and extreme sensitivity to rejection. People with this disorder genuinely want social connection but avoid it because the fear of being judged negatively is overwhelming.
Dependent personality disorder involves a constant, excessive need to be cared for. Decision-making feels impossible without reassurance from others, and the thought of being alone or having to manage independently can trigger intense anxiety.
Obsessive-compulsive personality disorder (OCPD) is characterized by rigid perfectionism, a need for control, and preoccupation with rules and order. This is not the same as obsessive-compulsive disorder (OCD). OCD involves intrusive thoughts and repetitive behaviors a person recognizes as irrational. OCPD is a broader personality pattern where the rigidity feels natural and even desirable to the person experiencing it.
How the International System Differs
The World Health Organization’s latest classification system, the ICD-11, takes a fundamentally different approach. Rather than listing 10 separate disorders, it treats personality disturbance as a single spectrum ranging from mild to moderate to severe. Instead of receiving a specific label like “borderline” or “avoidant,” a person is assessed on their overall level of personality dysfunction and then described using five broad trait domains: negative affectivity, detachment, dissociality, disinhibition, and a rigid perfectionism trait called anankastia.
This dimensional model aligns more closely with how personality traits actually work in research. People rarely fit neatly into one of 10 boxes, and the shift toward a spectrum approach has been found to be less stigmatizing. The DSM-5-TR itself includes a similar dimensional framework, called the Alternative Model for Personality Disorders, in its research section, though the traditional 10-disorder system remains the one most clinicians use day to day.
Overlap and Co-occurring Conditions
Personality disorders rarely exist in isolation. Data from the National Comorbidity Survey Replication found that 84.5% of people with a personality disorder also had at least one other mental health condition in the same year. Anxiety disorders were the most common overlap, co-occurring in 52.4% of people with any personality disorder. Mood disorders like depression appeared in about 24%, and substance use disorders in roughly 23%.
For borderline personality disorder specifically, the overlap is even more pronounced. About 60% of people with BPD also had an anxiety disorder, 38% had a substance use disorder, and 49% had an impulse control disorder. This high rate of co-occurrence is one reason diagnosis can be complicated. Symptoms of the personality disorder can be mistaken for, or masked by, the co-occurring condition.
It’s also common for a person to meet criteria for more than one personality disorder at the same time, which is part of why the field has been moving toward dimensional models that describe traits on a continuum rather than assigning a single categorical label.
What Makes Something a Personality Disorder
Having some traits associated with a personality disorder doesn’t mean you have one. Everyone is suspicious sometimes, or craves attention, or avoids uncomfortable social situations. For a pattern to qualify as a personality disorder, it needs to be rigid and pervasive across many areas of life, present since at least adolescence or early adulthood, and cause significant distress or problems in relationships, work, or daily functioning. The pattern also can’t be better explained by another mental health condition, a medical condition, or substance use.
Personality disorders are among the most misunderstood diagnoses in mental health. They describe deeply ingrained patterns, not character flaws, and most respond to sustained treatment. The specific approach varies by disorder, but long-term therapy focused on building new relational and emotional skills is the most common path forward.