Patient data regarding psychosis and VTE were extracted from the hospital medical record system. Psychosis-related information included disease type, the Hamilton Anxiety Scale (HAMA) and Hamilton Depression Scale (HAMD), and treatments administered including restraint, artificial hibernation, antipsychotic, antidepressant, and electroconvulsive therapy (ECT). VTE-based information included thrombus distribution. We obtained demographic data regarding admission and investigated the approximate incidence of each mental illness and the clinical features of VTE, including VTE distribution in the left and right extremities and venous involvement. Based on the site of thrombosis, patients with VTE were categorized into proximal and distal DVT groups, and we performed intergroup comparison of characteristics and risk factors for mental illnesses. Patients with VTE were further categorized into PE and non-PE groups based on detection of PE. We also performed intergroup comparison of types of mental illnesses and mental disorder scores.