The patients were 47 men and three women with a mean age of 42 years (range=29–75). Most (N=34) were treated in medical units, 13 were in surgical units, and three were in the neurology service. They had a mean length of stay of 9.8 days (range=1–83.) The history of recent drinking for three patients was none. Their retrospective diagnoses included 20 with delirium tremens, six with acute intoxication, four with alcohol withdrawal, two with seizures without delirium, and one with alcohol hallucinosis=1. The remaining 17 patients met our criteria for "multifactorial delirium in chronic alcoholics"; that is, these patients with delirium also had serious medical and surgical problems, especially traumatic injuries, which were more extensive than those ordinarily seen in patients with delirium tremens. There were two deaths; both patients were retrospectively diagnosed as having multifactorial delirium.