摘要:In Japan, although a strict lockdown has not been implemented, a self-restraint lifestyle continued, in which university students were required to refrain from going out carelessly and not to participate in various social activities. We aimed to explore the link between COVID-19-related problems and mental health (i.e., depression, anxiety, stress, and well-being), and the risk of PTSD and complex PTSD in the link among Japanese university students. Method: An online survey was conducted with 1,345 university students in February 2021. Participants completed self-report questionnaires, which included socio-demographic questions; items related to physical health and life problems related to Covid-19; Life Events Checklist (LEC); International Trauma Questionnaire (ITQ); Depression, Anxiety, and Stress Scales (DASS-21); and Satisfaction with Life Scale (SWLS). Results: In this sample, estimated prevalence rates of PTSD and CPTSD were 6.5 and 10.7%, respectively. As for the role of COVID-19, correlation analyses revealed that the COVID-19- related physical health problem was positively associated with anxiety and stress. A series of analyses of variance showed that participants exposed to child abuse and those exposed to other traumatic life events scored a lower level of well-being, and higher levels of stress, anxiety, and depression compared to non-trauma-exposed students. In addition, participants exposed to childhood abuse scored high on anxiety when they had a high COVID-19-related physical health problem. Conclusions: The results suggest that youth who have experienced serious trauma in the past may be at increased risk of mental health problems due to the physical health problems related to COVID-19.