The aim of this study was to investigate the differences in the prevalence of somatic diseases among combat veterans and their contemporaries who were not exposed to the traumatic experience at the battlefield, and to determine whether socio-demographic factors, exposure to war-time trauma and/or injury might predict individual somatic diseases. The study included 1,558 subjects living in south Croatia: 501 male combat veterans with Posttraumatic Stress Disorder (PTSD) and the corresponding control group of 825 men who were not exposed to combat experience. Veterans with PTSD, regardless of the length of time spent in war, suffered more often from cardiovascular, dermatological, musculoskeletal, pulmonary and metabolic diseases than corresponding control subjects who were not exposed to combat experience. The predictors of cardiovascular, musculoskeletal and malignant diseases in veterans were age, length of time spent in combat, having been wounded. A longer period in the combat zone was associated with arrhythmias in veterans with PTSD complicated with other psychiatric comorbidities. PTSD as a result of exposure to war trauma increases the possibility of developing somatic diseases.