Background: Research shows that post-traumatic stress symptoms (PTSS) are common in survivors of acute life-threatening illnesses, and rumination is considered to be associated with PTSS. Additionally, post-stroke symptoms of post-traumatic stress disorder (sPTSD) usually manifest as a type of anxiety disorder after a stroke. This study investigated the prevalence of sPTSD and the relationship between PTSS and rumination.Methods: The participants comprised 29 patients admitted to the Saitama Medical University International Medical Center within one week after experiencing a stroke. The Impact of Event Scale-Revised Japanese version (IES-R-J) and Leuven Adaptation of the Rumination on Sadness Scale Japanese version (LARSS-J) were employed for the evaluation of PTSS, sPTSD, and rumination.Results: The 29 patients (15 males, mean age: 63 ± 11 years) were classified as follows: 17 patients with cerebral infarction, 10 patients with cerebral hemorrhage, and 2 patients with subarachnoid hemorrhage. The ratio of persons with sPTSD (IES-R-J total score > 25) was 34% (10 patients). A significant positive correlation was found between PTSS and rumination (r = 0.460, p < 0.05).Conclusion: The findings indicated that approximately 30% of acute stroke patients experienced sPTSD, and that the severity of PTSS is related to rumination.