An analysis of 1458 case histories of patients with a combined trauma has shown that 276 of the patients died, the lethality was 18.9%. The severity of each injury was estimated by the AIS scale, the severity of combined traumas--by the ISS scale. The syndrome of mutual aggravation of injuries manifested itself most brightly in the cases where one or more main injuries were dangerous for life. Of the greatest importance was an addition of the closed chest trauma to the dominating injury that resulted in a greater number of bronchial-pulmonary complications. Severe damages of the loco-motor system increased the number of thrombo- and fat embolism.