BackgroundMistreatment is a behavior that reflects disrespect for the dignity of others. Mistreatment can be intentional or unintentional, and can interfere with the process of learning and perceived well-being. This study explored the prevalence and characteristics of mistreatment, mistreatment reporting, student-related factors, and consequences among medical students in Thai context.MethodsWe first developed a Thai version of the Clinical Workplace Learning Negative Acts Questionnaire-Revised (NAQ-R) using a forward-back translation process with quality analysis. The design was a cross-sectional survey study, using the Thai Clinical Workplace Learning NAQ-R, Thai Maslach Burnout Inventory-Student Survey, Thai Patient Health Questionnaire (to assess depression risk), demographic information, mistreatment characteristics, mistreatment reports, related factors, and consequences. Descriptive and correlational analyses using multivariate analysis of variance were conducted.ResultsIn total, 681 medical students (52.4% female, 54.6% in the clinical years) completed the surveys (79.1% response rate). The reliability of the Thai Clinical Workplace Learning NAQ-R was high (Cronbach’s alpha 0.922), with a high degree of agreement (83.9%). Most participants (n= 510, 74.5%) reported that they had experienced mistreatment. The most common type of mistreatment was workplace learning-related bullying (67.7%), and the most common source was attending staff or teachers (31.6%). People who mistreated preclinical medical students were most often senior students or peers (25.9%). People who mistreated clinical students were most commonly attending staff (57.5%). Only 56 students (8.2%) reported these instances of mistreatment to others. Students’ academic year was significantly related to workplace learning-related bullying (r= 0.261,p< 0.001). Depression and burnout risk were significantly associated with person-related bullying (depression:r= 0.20,p< 0.001, burnout:r= 0.20,p= 0.012). Students who experienced person-related bullying were more often the subject of filed unprofessional behavior reports, concerning conflict or arguments with colleagues, being absent from class or work without reasonable cause, and mistreatment of others.ConclusionsMistreatment of medical students was evident in medical school and was related to the risk for depression and burnout, as well as the risk of unprofessional behavior.Trial registrationTCTR20230107006(07/01/2023).