Background: Medical malpractice lawsuits in Thailand have been increasing, often leading to conflicts among stakeholders that could deteriorate the doctor-patient relationship and the public trust in healthcare services. To address this complex problem, we report on a systems thinking approach to developing a mutual understanding among stakeholders on the root causes of deteriorating trust in healthcare services and weakening doctor-patient relationships in the contexts of medical errors.Methods: We adopted a systems thinking approach and conducted a series of group model building sessions with participating stakeholders from various organizations in Thailand (n=20), including policymakers, administrators of healthcare organizations, healthcare providers, advocates of patient rights, and the victims of medical errors. The initial causal loop diagram was mutually created during the group model building workshop. It was then reviewed and elaborated by community leaders and experts in patient safety and health systems development. Results: The group model building process revealed that the shared understanding of what causes this persistent problem is lacking, and that multiple perspectives are needed to create sustainable solutions. The final model of our causal loop diagram, which explains why both the public trust in healthcare services and the doctor-patient relationship have been deteriorating over time, consists of four domains: 1) medical errors and malpractice lawsuits; 2) the roles of third-party beneficiaries in medical lawsuits and the conflicts presented on mass and social media; 3) the public trust of healthcare services; 4) the healthcare quality improvement efforts.Conclusions: Our findings provide an insight into the potential high-leverage points within health systems for reducing medical errors, improving public trust in healthcare services, and strengthening the doctor-patient relationship in Thailand. One of the emerging policy recommendations was to change the existing law towards a balance of monetary and non-monetary remedies for victims of medical errors.