Schizoid personality disorder (SPD) is a cluster A personality disorder characterized by a lack of interest in social relationships, a tendency towards a solitary lifestyle, and emotional coldness. SPD is reasonably rare compared with other personality disorders. Its prevalence is estimated at less than 1% of the general population.

  1. Weak interpersonal skills
  2. Difficulty expressing anger, even when provoked
  3. "Loner" mentality; avoidance of social situations
  4. Appear to others as remote, aloof, and unengaged
  5. Low sexual desire
  6. Unresponsive to praise or criticism
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