Fawcett discusses the importance of recognizing undiagnosed patients with lethal depression, as many of these people go on to commit suicide. More than 50% of suicides occur in people with no contact with a mental health professional, although 90-95% have a psychiatric disorder. Educating the public about suicide risk detection is important. Acute suicide risk identification & treatment suggestions are given. Chronic suicide risk intervention, such as the use of lithium, is discussed. (34 refs.)