Significant outcomes: This is one of the largest studies investigating the risk factors for violence in patients with delirium in a general hospital. Current smoker status, older age, male gender, and use of intensive care units were identified as factors associated with violence in patients with delirium.Limitations: This was a retrospective study based on clinical practice at a single hospital. Further studies on this topic by other general hospitals will help establish the present results. Some of the factors that could be implicated in delirium-induced violence were not included in this study. These include: some medications, physical conditions such as pain, psychological conditions such as anxiety, use of uncomfortable and/or painful medical procedures such as urethral drainage tubes, and a history of behavioral disturbance.