This article on Post-Traumatic Stress Disorder (PTSD) examines the potential for "elevated risk for trauma exposure" among people with mental illness. From the article: "There is growing evidence suggesting that persons with severe mental illness (SMI) are at sharply elevated risk for trauma exposure and for the development of PTSD. However, despite almost two decades of published reports and clinical concern, the intersection between traumatic life-events, PTSD, and other severe and persistent mental illnesses (such as schizophrenia or bipolar disorder) remains unclear. Although recent research is beginning to address and clarify these issues, important questions remain regarding such basic issues as: the magnitude of the association between SMI, trauma exposure, and PTSD; the underlying mechanisms of this association; and implications for the treatment of clients with these comorbidities."
National Center for PTSD: http://www.ptsd.va.gov/
PTSD Research Quarterly (Summer 2002), v.13 no.3