After the war in Syria, many people were forcibly displaced, and many others migrated to foreign countries. Many Syrians have been exposed to traumatic negative lifeexperiences during this process. In this context, this study was carried out to investigate the effects of pre- and post-migration traumatic experiences and living difficulties on the development of post-traumatic stress disorder (PTSD) in Syrian refugees who have been residing in Turkey for more than five years. The sample size of this cross-sectional study consisted of 200 Syrian refugees. Research data were collected using a self-report questionnaire. Refugees' depression and anxiety levels were assessed with The Hopkins Symptom Checklist-25 (HSCL-25), and post-traumatic stress disorder (PTSD) symptoms were assessed with the PTSD Checklist for the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) (PCL-5). Logistic regression models were created to assess the effects of pre- and post-migration traumas, adverse events, and other sociodemographic variables, including age and gender, on PTSD. The study unveiled a high prevalence of PTSD (55.5%), depression (33.5%), and anxiety(4.5%) among participants. Notably, male refugees and those exposed to armed conflict exhibited a significantly higher frequency of PTSD. In contrast, depression was more prevalent among female participants. Pre-migration traumatic experiences, especially near-death situations, were identified as significant predictors of PTSD. Interestingly, while pre-migration traumatic experiences were higher, post-migration living difficulties also emerged as a concern, with factorslike "inability to return home in emergencies" and "worries about losing ethnic identity" beinghighlighted. Path analysis further revealed that pre-migration traumatic experiences indirectly contributed to PTSD by exacerbating post-migration living difficulties. Syrian refugees in Turkey, even after long-term residence, exhibit high rates of PTSD, depression, and anxiety. While pre-migration traumas play a pivotal role, post-migration challenges further compound their mental health issues. These findings underscore the need for holistic, long-term mental health interventions that address both past traumas and current living difficulties.