Personality Disorders

Source: MedlinePlus Health Topics, U.S. National Library of Medicine

Last synced 8/4/2026Status: primary verified

What is personality? Your personality is your own way of thinking, feeling, behaving, and relating to others. Once you become an adult, your personality usually doesn't change much. What are personality disorders? Personality disorders are a group of mental disorders . They involve long-term patterns of thoughts and behaviors that are different from what is considered normal in your culture. The thoughts and behaviors are unhealthy and inflexible. They cause serious problems with relationships, work, and social activities. They can make it hard to deal with everyday stresses and problems. What are the types of personality disorders? There are 10 types of personality disorders. They are grouped into three different categories called clusters. The types in each cluster have some similar symptoms and characteristics. The clusters and types are: Cluster A personality disorders involve unusual and odd thoughts and behaviors. It includes: Paranoid personality disorder, in which a person has paranoia (an extreme fear and distrust of others). They may think that someone is trying to harm them. Schizoid personality disorder, in which a person prefers to be alone and is not interested in having relationships with others. Schizotypal personality disorder, in which a person has unusual thoughts and ways of behaving and speaking. They are uncomfortable having close relationships with others. Cluster B personality disorders involve dramatic and emotional thoughts and behaviors that can keep changing. It includes: Antisocial personality disorder, in which a person has a long-term pattern of manipulating, exploiting, or violating the rights of others. Borderline personality disorder, in which a person has lots of trouble managing their emotions. This makes them impulsive and uncertain about how they see themselves. It can cause a lot of trouble in their relationships. Histrionic personality disorder, in which a person is dramatic, has strong emotions, and always wants attention fro

Educational only

This information is for general education and is not medical advice. Always talk to a licensed U.S. clinician about your situation, medications, or treatment decisions.