The potential of Health Information Technology (HIT) to increase the quality of healthcare delivery is well documented but improvements can be hindered if physicians and nurses resist HIT. However, the technology is still facing resistance. The literature suggests that user resistance to HIT is predi-cated on their perception of its impact. However, we do not fully understand how users' perception is formed. In response, this study investigates the antecedents of perceived threats by examining the organisational factors, the personal traits of the user, HIT-related factors, and the factors related to the interaction between physicians and nurses and the organisation that lead to perceived threats. This study uses a case study of a military hospital to understand the antecedents of perceived threats and user resistance. The findings of the study indicate that dissatisfaction and risks are the main components of perceived threats of HIT for physicians and nurses. Furthermore, the study suggests that the antecedents of perceived threats are: system incompatibility, management support, related knowledge, and lack of trust. This research will contribute to identifying the core reasons for re-sistance and will lead to a better understanding of the phenomenon, hence, can help organisations solve the root causes of the problem.