Personality disorder signifies deeply rooted and persistent behavioural patterns that are inflexible and hinder the adaptation to various circumstances and situations in life.
In the DSM-IV, personality disorders are classified into three main clusters.
- Cluster A: paranoid, schizoid and schizotypal personality disorders. These persons often appear odd or eccentric.
- Cluster B: antisocial and narcissistic personality disorders. These persons are often dramatic, impulsive and emotionally unstable.
- Cluster C: avoidant, dependent and obsessive-compulsive disorders. These persons are often anxious or phobic.