It's rumored that stars like Britney Spears and Lindsey Lohan suffer from borderline personality disorder. Among other symptoms, BPD sufferers have mood swings, which may cause self-destructive behavior, and even violence. Learn more now!

Paranoid personality disorder is often seen in people with schizophrenia. This severe, unfounded paranoia and mistrust of others is often treated with psychotherapy. Here's a quick look at paranoid personality disorder.

Purpously cutting yourself with a razor blade or knife may sound crazy, but many people find inflicting self harm to be a release of tension and an effective balm for feelings of depression. Here, a closer look at people who cut.