Personality disorders vs. Behavior

Personality disorders are chronic psychological disorders, which can greatly affect a person's life. Having a personality disorder can negatively affect one's work, one's family, and one's social life.Ten personality disorders, grouped into 3 clusters, are defined in the DSM-IV:

Cluster A -- Odd or eccentric behavior.
Includes:
Paranoid personality disorder
Schizoid personality disorder
Cluster B -- Dramatic, emotional or erratic behavior.
Includes:
Antisocial personality disorder
Borderline personality disorder
Histrionic personality disorder
Narcissistic personality disorder
Cluster C -- Anxious fearful behavior.
Includes:
Avoidant personality disorder
Dependent personality disorder
Obsessive-compulsive personality disorder

I will write about few disorders. first of all not very rare is Narcissistic personality disorder. The narcissist is described as being excessively preoccupied with issues of personal adequacy, power, and prestige by www.wikipiedia.org. it is identified five subtypes of this disorder: In-principled narcissist (fraudulent, exploitative, deceptive and unscrupulous individual), amorous narcissist (erotic, exhibitionist), compensatory narcissist (negativistic, passive-aggressive, avoider),fanatic type (paranoid, with major paranoid tendencies who) and elitist narcissist - variant of pure pattern. Narcissism might be very dangerous if it is very expressed. Person with this illness even can kill for personal reasons which for "normal" people would look very stupid.

Dissociative identity disorder is described as condition in which a person displays multiple distinct identities or personalities. People diagnosed with DID often report that they have experienced severe physical and sexual abuse, especially during their childhood. people with this illness suffers at least two clear identities or personality states. Some individuals with DID have been found to have personality states that have distinctly different ways of reacting, in terms of emotions, pulse, blood pressure, and even blood flow to the brain.

Histrionic personality disorder (HPD) is a personality disorder characterized by a pattern of excessive emotionality and attention-seeking, including an excessive need for approval and inappropriate seductiveness, usually beginning in early adulthood. These individuals are lively, dramatic, enthusiastic, and flirtatious. People with this disorder are usually able to function at a high level and can be successful socially and professionally. People with histrionic personality disorder usually have good social skills, but they tend to use these skills to manipulate other people and become the center of attention.[1] Furthermore, histrionic personality disorder may affect a person's social or romantic relationships or their ability to cope with losses or failures.

There are many personality disorders. they might be very dangerous, annoying, or invisible. the main thing between disorder and normal behavior is that all characteristics are more expressed than in a normal situations or personality. it must be detected and treated.
Try to do a test http://www.4degreez.com/misc/personality_disorder_test.mv and see.