A review of unrecognized mental illness in primary care. Prevalence, natural history, and efforts to change the course

Studies of the prevalence, natural history, and outcome of unrecognized mental illness in general medical outpatient settings were reviewed. Approximately half of the patients with a psychiatric disorder were not recognized as having a mental illness by their primary care physician. The natural history of unrecognized mental illness suggests a poorer clinical course of anxiety disorders but not for depressive disorders. Most interventions demonstrated a significant improvement in the physician's ability to identify and treat psychiatric disorders but had a minimal effect on patient symptoms and no effect on short-term health care use. Although primary care physicians do not recognize psychiatric disorders in a high percentage of patients, efforts to improve recognition may not lead to decreased patient suffering or decreased health care costs.