Guide: Personality Disorders – The 3 Clusters

Personality Disorders DSM

*Disclaimer: I’m not a licensed mental health professional or a psychiatrist, so please refrain from asking for personal or medical advice.

Also, please avoid self-diagnosing. If you suspect a loved one may be struggling, please seek out professional help as soon as possible.

There are three clusters in total which span 10 different personality disorders according to the DSM-V, a clinical psychiatric guideline to formal diagnosis and treatment.

It is estimated that around 9-10% of the U.S. population has a personality disorder at any given time, but most cases are either misdiagnosed (as anxiety or depression)—or not diagnosed at all.

Personality disorders are often co-morbid (i.e. existing at the same time) with other mental health conditions, such as depression or anxiety.

Cluster A: Odd / Eccentric

Eccentric personality disorders focus on “strangeness” in thoughts, beliefs, and behaviors. Individuals may have trouble “fitting in” and making friends because of their esoteric interests and tastes.


Out-of-proportion skepticism and second-guessing are hallmark behaviors of Paranoid personality disorder. An underlying fear that information will eventually be used against your best interests is present through each interaction.

Signs of Paranoid Personality Disorder:

  • Wary and suspicious of others’ motives
  • Trouble sleeping due to intrusive thoughts
  • Guarded and private about personal life
  • Confirmation biases toward perceived schemes
  • Darting, scanning eyes, ready to spot danger


Schizoid personality disorder leads to a chronic avoidance of social situations and the difficulty of expressing appropriate emotions. Anhedonia (i.e. the inability to experience positive emotions) is also common.

Signs of Schizoid Personality Disorder:

  • Emotional blankness
  • Little to no interest in forming relationships
  • Prefers solitude and quiet
  • Trouble with motivation and planning
  • Low EQ (Emotional Quotient)


Different from Schizophrenia (which is an official clinical and biological condition), Schizotypal personality disorder comes with a set of far-off and unusual beliefs, often involving a “mission” or “calling” to fulfill.

Signs of Schizotypal Personality Disorder:

  • Far-off beliefs and daydreams
  • Difficulty distinguishing between reality and imagination
  • Bizarre mannerisms and behaviors
  • May travel to a place or meet a person as part of “mission”
  • Few close relationships, or none at all

Cluster B: Dramatic

Dramatic personality disorders capitalize on both instability and unpredictability. Individuals follow their own whims and give little to no regard to formal (written or unwritten) rules or systemic structures.


With a particularly misleading name, antisocial refers to the demonstration of a range of criminally deviant and morally unjust behaviors such as setting fires, manipulation, and physical (often dangerous) aggression towards humans or animals.

Early rejection from peers may have an effect on the onset of antisocial tendencies. Bullying and subversive treatment appear to influence the flare-up of antisocial behavior during adolescent years and beyond.

Signs of Antisocial Personality Disorder:

  • Trouble with the law and/or in school
  • Damaging behavior toward property or animals
  • Impulsive and follows whims
  • Lack of long-term goals or insight
  • Considers self as free and independent


Similar to the narcissistic personality disorder (NPD), histrionics demand constant attention and acts as if life is a stage—and they play the leading role. Any opportunity for admiration and shameless self-promotion is seized and amplified in the glistening eyes of a histrionic.

They will ruffle others’ feathers on purpose (or even as learned by accident) to garner sympathy and continue feeding into their egos and grandiose self-image. Drama and fuel to the fire secretly excites them.

During calm periods, they may experience boredom and stir up a storm in a teapot to chase the next high.

Signs of Histrionic Personality Disorder:

  • Flashy clothing and/or behaviors
  • Never-ending train of drama
  • Charismatic, excellent first impressions
  • Dramatic voice changes and inflections
  • Seeks stimuli to keep energy levels high


While the histrionic may be comfortable with being the star of their own show (i.e. immediate group of family and friends), narcissists fantasize about achieving unlimited power, fame, glory, and success. Think big-scale and internationally.

Arrogant and delusionally self-confident, narcissists demand special treatment in any situation and lack empathy (while being unaware of it).

For example, they may cut lines, make exclusive demands in restaurants—and proceed to leave a one-star review ranting about how convoluted and horrendous the service is.

Signs of Narcissistic Personality Disorder:

  • Low to no empathy
  • Constantly reverts conversation back to self
  • Believes others are jealous; struggles with jealousy
  • Daydreams of unlimited success, fame, or power
  • Deep-seated need for external admiration


Characterized by fluctuating periods of instability, Borderline Personality Disorder (BPD) comes with excessive idealization of relationships, sudden shifts in life goals, high impulsivity, and reckless behaviors.

Self-harm and mutilation is common, as their self-image is often painted in a negative light. The development of BPD is commonly thought to be influenced by childhood neglect or abuse, whether physical or psychological.

Interestingly, individuals with Borderline tendencies are among the least likely to seek out professional treatment and help for their condition as they have a sense certainty in their behavior, despite finding themselves in trouble and dangerous situations regularly.

Signs of Borderline Personality Disorder:

  • Unstable and volatile relationships
  • Self-mutiliation or harmful behavior
  • Fears abandonment and isolation
  • Fluctuating mood and emotional states
  • Black-and-white thinking and attitudes

Cluster C: Anxious

Anxious personality disorders circulate around fear and pressing feelings of inadequacy. Emotions often manifest into physiological behaviors, such as headaches, fatigue, shakiness, and tension.


With the irrational fear of rejection in public situations, avoidants actively steer clear of social situations where they face potential humiliation.

Also, they selectively choose to avoid making new friends or acquaintances unless they are absolutely sure of their trust and acceptance.

As a result, they may choose career paths that limit interactions with people as much as possible. This perpetuates their syndromes and escalates a seemingly silent issue of the psyche.

Signs of Avoidant Personality Disorder:

  • Hesitant, shies away from social interaction
  • Sensitive about external perceptions and attitudes
  • Underlying and pervasive fear of rejection
  • May be socially anxious and fearful
  • Self-esteem issues due to self-imposed social ineptitude


Major and minor life decisions all require external input and guidance from others.

Dependents desperately cling to relationships and feel an overwhelming sense of impending doom when asked to be independent and make their own choices.

Their core, underlying fear is to be left and alone and helpless—with no one to confide in. At the first sight of abandonment or conflict, they may jump to conclusions and feel the crushing weight of imagined doom.

Signs of Dependent Personality Disorder:

  • Weak and fragile sense of self
  • Reliance upon others to make decisions
  • Need to be taken care of
  • Childish and less mature for age
  • Assurance-seeking from superiors

Obsessive-Compulsive (OCPD)

Aside from stereotypical and repetitive rituals such as hand-washing or checking the lock before leaving (characteristic of OCD, not OCPD), obsessive-compulsive personality disorder also ties into thought patterns and a need to do things the “correct” way, as perceived by the individual.

For instance, an individual with OCD may like to have their morning tea at exactly 6:55am every morning. Another may click their pens 17 times before writing.

An extremely specific schedule may govern their day-to-day life, and a single deviation or interruption to it may completely frazzle and disorient them. OCPD is characterized by extreme control and perfectionism—which can result in workaholic behaviors.

Signs of Obsessive-Compulsive Personality Disorder:

  • Physiological symptoms such as tension or stomachaches from overthinking and ruminating
  • Considers self as a righteous and “good” member of society
  • Highly attuned to societal rules and norms
  • Views world in terms of organized hierarchies
  • Stresses importance of productivity and hard work

Personality Disorders: Summary

  • Cluster A: Odd / Eccentric – Paranoid, Schizoid, Schizotypal
  • Cluster B: Dramatic – Antisocial, Histrionic, Narcissistic, Borderline
  • Cluster C: Anxious – Avoidant, Dependent, Obsessive-Compulsive

Looking for more clinical information? Head on over to our popular Dark Personality Triad post.


Tyrer, P., Mulder, R., Crawford, M., Newton-Howes, G., Simonsen, E., Ndetei, D., Koldobsky, N., Fossati, A., Mbatia, J., Barrett, B. (2010, February). Personality disorder: a new global perspective. World Psychiatry.

A Guide to DSM-5: Personality Disorders. Medscape Psychiatry, Bret S. Stetka, MD, Christoph U. Correll, 21 May 2013.

Theodore Millon; Roger D. Davis (1996). Disorders of Personality: DSM-IV and Beyond. New York: John Wiley & Sons, Inc. p. 226. ISBN: 978-0-471-01186-6.