Aim: The main goal of this research was to determine if there is a difference in intensity and frequency of symptoms between war veterans diagnosed with PTSD and those diagnosed with complex PTSD, as well as to determine if there is a difference in various sociodemographic characteristics between veterans with PTSD and those with complex PTSD. Materials and methods: This research was conducted on 100 participants, namely war veterans treated from PTSD in the Regional Centre for Psychotrauma and the Department of Psychiatry of the University Hospital Split. Measuring instruments used for this research are CAPS V (Clinician-Administered PTSD Scale) and ITQ (International Trauma Questionnaire). CAPS V was used to diagnose PTSD and to evaluate the intensity and frequency of symptoms, while ITQ was used to specifically diagnose complex PTSD. Of the original 100 participants, 73 of them met the criteria for diagnosis and gave the complete data. Results: The intensity of symptoms was higher in veterans with complex PTSD (46,1 ± 10,36) than the intensity in veterans with PTSD (39,5 ± 11,87), and this difference was statistically significant. The frequency of symptoms was also higher in veterans with complex PTSD (15,5 ± 2,38) than the frequency in veterans with PTSD (14 ± 3,11), which was also statistically significant. The greatest statistically significant difference was determined in the intensity (P=0,002) and frequency (P=0,001) of the arousal symptoms. Conclusion: Veterans with complex PTSD develop symptoms of higher intensity and frequency than veterans with PTSD, which proved to be of statistical significance. No statistically significant difference was determined in relation to the sociodemographic characteristics (age, year of first diagnosis, employment status, years of employment) between veterans with PTSD and those with complex PTSD.