Cluster A personality disorders are described as the "odd or eccentric disorders". They include:

• Paranoid personality disorder
• Schizoid personality disorder
• Schizotypal personality disorder

Paranoid personality disorder

• Characterised by irrational suspicion and mistrust of others
• Often hypersensitive to criticism
• Reluctant to confide and preoccupied with perceived conspiracies against themselves

Schizoid personality disorder

• Characterised by a lack of interest in others, apathy and a lack emotional breadth.
• They tend to have few friends and do not form relationships, preferring solitary activities.

Schizotypal personality disorder

• Characterised by a pattern of extreme difficulty interacting socially, bizarre or magical thinking and distorted perceptions.
• Inappropriate behaviour and strange speech and affect can cause others to perceive them as strange.
• They share some features with schizophrenics, but maintain a better grasp on reality.