"People with personality disorders have long-standing patterns of thinking and acting that differ from what society considers usual or normal. The inflexibility of their personality can cause great distress, and can interfere with many areas of life, including social and work functioning. People with personality disorders generally also have poor coping skills and difficulty forming healthy relationships. The Diagnostic and Statistical Manual of Mental Disorders (DSM-5), which is the standard reference book for recognized mental illnesses, organizes personality disorders into three main categories, with several types of personality disorders in each category:
 

Eccentric Personality Disorders

People with these disorders often appear odd or peculiar. The eccentric personality disorders include:

• Paranoid Personality Disorder: Paranoia is the hallmark of this disorder. People with paranoid personality disorder have a constant mistrust and suspicion of others. They believe that others are trying to demean, harm, or threaten them.

• Schizoid Personality Disorder: People with this disorder are distant, detached, and indifferent to social relationships. They generally are loners who prefer solitary activities and rarely express strong emotion.

• Schizotypal Personality Disorder: People with this disorder display unusual thinking and behavior, as well as appearance. People with schizotypal personality disorder might have odd beliefs and often are very superstitious.

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Dramatic Personality Disorders

People with these disorders have intense, unstable emotions and a distorted self-image. They also often tend to behave impulsively. These disorders include:

• Antisocial Personality Disorder: People with this disorder are sometimes called “sociopaths” or “psychopaths.” This disorder is characterized by rash, irresponsible, and aggressive behavior, which often is expressed by a disregard for others and an inability to abide by society’s rules. People with this disorder often commit serious crimes and have a lack of remorse for their actions.

• Borderline Personality Disorder: This disorder is marked by unstable moods, poor self-image, chaotic relationships, and impulsive behavior (such as sexual promiscuity, substance abuse, over-spending, and reckless driving).

• Histrionic Personality Disorder: People with this disorder are shallow and constantly seek attention. They often are very dramatic, possibly even childish, and overly emotional.

• Narcissistic Personality Disorder: This disorder is characterized by an exaggerated sense of superiority, and a preoccupation with success and power. However, this preoccupation is fueled by a fragile self-esteem. People with this disorder are very self-centered, tend to lack empathy, and require constant attention and admiration.

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Anxious Personality Disorders

People with these disorders often are nervous or fearful. These disorders include:

• Avoidant Personality Disorder: People with this disorder tend to avoid social contacts. This behavior is not the result of a desire to be alone but due to excessive concern over being embarrassed or harshly judged. They often miss out on many valuable social experiences because of their fear of being rejected.

• Dependent Personality Disorder: This disorder is marked by dependency and submissiveness, a need for constant reassurance, feelings of helplessness, and an inability to make decisions. People with dependent personality disorder often become very close to another individual and spend great effort trying to please that person. They tend to display passive and clinging behavior, and have a fear of separation.

• Obsessive-Compulsive Personality Disorder: This disorder is characterized by a pattern of perfectionism and inflexibility, control and orderliness, with a strong fear of making mistakes. This fear often results in an inability to make decisions, difficulty finishing tasks, and a preoccupation with details.

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People might have mixed symptoms of more than one personality disorder.

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~from Cleveland Clinic