Sources and references for: Sociopath Defintion

Question:

My friend loves to date different guys, have sex with them and after a few weeks or months, dump them. She is a great liar and her mood swings are terrible. She is also an expert in toying around with men's feelings, and she loves self inflated pain. She loves to read people's mind and play pyscho. She is always on her guard against people. This has been going on since she was a teenager and now she is 27 years old.

Is this kind classified as mental illness? Is it very serious and how can I help her???

Sources, references:

1. AMERICAN PSYCHIATRIC ASSOCIATION, WASHINGTON, DC (1994). DIAGNOSTIC AND STATISTICAL MANUAL OF MENTAL DISORDERS: DSM-IV, 4TH ED. P.645-650 Antisocial Personality Disorder.
2. Clinical experience and knowledge of Gunborg Palme, Gunborg Palme, certified psychologist and certified psychotherapist, teacher and tutor in psychotherapy.