Reports of attempted or actual physical assaults by patients in the inpatient, outpatient, and emergency settings of a psychiatric facility within a general hospital were prospectively surveyed during a one-year period. Among 397 patients discharged during the period, 46 patients were responsible for 133 violent incidents. Most incidents occurred on the locked inpatient unit during the daytime and after the first week of admission. Schizophrenia was the only diagnosis significantly associated with violence. Hitting was the most prevalent form of violence, and nurses were the most frequent targets.