Personality disorders are divided into three main categories. Cluster A includes disorders that exhibit eccentric or odd behaviors; Cluster B includes disorders characterized by dramatic, emotional, or erratic behaviors; and Cluster C encompasses disorders characterized by anxious or fearful behaviors.

Cluster A Personality Disorders

Paranoid Personality Disorder
A pervasive pattern of distrust and suspiciousness of others, such that their motives are interpreted as malevolent, beginning in early adulthood and present in a variety of contexts. The following characteristics are typically observed:
* Unjustified suspicions that others are exploiting, harming, or deceiving them.
* Reluctance to confide in others due to an unwarranted fear that the information will be used maliciously against them.
* Interprets ordinary remarks or events as demeaning or threatening.
* Persistently bears grudges and has difficulty forgiving.
* Recurrent, unjustified suspicions regarding the fidelity of their spouse or sexual partner.

Schizoid Personality Disorder
A pervasive pattern of detachment from social relationships and a restricted range of expression of emotions in interpersonal settings.
* Almost always chooses solitary activities.
* Lacks close friends or confidants other than first-degree relatives.
* Appears emotionally cold, detached, and has a limited/flat range of affect.

Schizotypal Personality Disorder
A pervasive pattern of social and interpersonal deficits marked by acute discomfort with, and reduced capacity for, close relationships, as well as by cognitive or perceptual distortions and eccentricities of behavior.
* Exhibits odd or eccentric thoughts and speech (e.g., vague, circumstantial, overly elaborate, or stereotyped).
* Has inappropriate or constricted affect.

Cluster B Personality Disorders

Antisocial Personality Disorder
A pervasive pattern of disregard for and violation of the rights of others, occurring since age 15.
* Frequent lying, use of aliases, conning others for personal profit or pleasure, and engaging in recurrent acts that are grounds for arrest are common behaviors.
* Frequently involved in fights, demonstrates irritability and aggression.
* Has difficulty sustaining consistent employment and tends to fail to honor financial obligations.
* Displays indifference and lack of remorse when having hurt, mistreated, or stolen from another.

Borderline Personality Disorder
A pervasive pattern of instability of interpersonal relationships, self-image, and affects, and marked impulsivity.
* Relationships are characterized by alternating between extremes of idealization and devaluation, making them inconsistent and often tumultuous.
* Identity disturbance and chronic feelings of emptiness, accompanied by recurrent suicidal thoughts, gestures, or threats, may be present.
* Inappropriate, intense anger or difficulty controlling anger is also common.

Histrionic Personality Disorder
A pervasive pattern of excessive emotionality and attention-seeking.
* Is uncomfortable when not the center of attention in any setting.
* Interaction with others is often characterized by sexually seductive or provocative behavior, which may be inappropriate.
* Consistently uses physical appearance to draw attention to self.
* Displays rapidly shifting and shallow expression of emotions.
* Is easily influenced by others and exhibits dramatic, exaggerated expressions of emotion.
* Considers relationships to be more intimate than they actually are.

Narcissistic Personality Disorder
A pervasive pattern of grandiosity, need for admiration, and lack of empathy.
* Has a grandiose sense of self-importance, exaggerates achievements and talents, and expects to be recognized as superior.
* Exploits others for personal gain and has an excessive need for admiration.
* Is unwilling to recognize or identify with the feelings and needs of others.
* Often behaves in an arrogant, haughty, or contemptuous manner towards others.

Cluster C Personality Disorders

Avoidant Personality Disorder
A pervasive pattern of social inhibition, feelings of inadequacy, and hypersensitivity to negative evaluation, leading to avoidance of occupational activities that involve significant interpersonal contact.
* Marked by feelings of inadequacy in social situations and extreme sensitivity to negative evaluation.
* Is unwilling to get involved with people unless certain of being liked.
* Shows restraint within intimate relationships because of the fear of being shamed or ridiculed.

Dependent Personality Disorder
A pervasive and excessive need to be taken care of that leads to submissive and clinging behavior and fears of separation.
* Has difficulty making everyday decisions without an excessive amount of advice and reassurance from others.
* Needs others to assume responsibility for most major areas of their life.
* Has difficulty initiating projects or doing things on their own.

Obsessive-Compulsive Personality Disorder
A pervasive pattern of preoccupation with orderliness, perfectionism, and mental and interpersonal control, at the expense of flexibility, openness, and efficiency.
* Is preoccupied with details, rules, lists, order, organization, or schedules to the extent that the major point of the activity is lost.
* Characterized by excessive conscientiousness, perfectionism, and efforts to maintain control over thoughts and interpersonal relationships.