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​Symptoms and Signs – Differential Diagnosis of Paranoid Personality Disorder
• Schizophrenia (paranoid type), delusional disorder (paranoid type), and mood disorder with psychotic symptoms: require presence of persistent positive psychotic symptoms such as delusions and hallucinations. To give an additional diagnosis of paranoid personality disorder (PPD), the personality disorder must be present before the onset of psychotic symptoms and must persist when the psychotic symptoms are in remission.
• Substance-induced paranoia, especially in the context of cocaine or methamphetamine abuse or dependence
• Personality changes due to a general medical condition that affects the central nervous system
• Paranoid traits associated with a sensory disability, for example, hearing impairment
• The most common co-occurring personality disorders are schizotypal, schizoid, narcissistic, avoidant, and borderline:
• Schizotypal personality disorder includes magical thinking and
unusual perceptual experiences.
• Schizoid and borderline personality disorders do not have
prominent paranoid ideation.
• Avoidant personality disorder includes fear of embarrassment.
• Narcissistic personality disorder includes the fear that hidden
“flaws” or “inferiority” may be revealed.
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