Purpose This study was conducted to determine the relationship of neglect and abuse behaviors experienced by nursing and child development students during their childhood with codependency, and the factors affecting codependency. Design and Methods This is a descriptive and correlational study. The study was conducted with 292 students who were studying at a Faculty of Health Sciences. Findings A positive relationship was found between neglect and abuse behaviors that lead to trauma in childhood, and codependency. It was determined that there was a negative relationship between students' codependency and childhood traumatic experiences and their levels of self-esteem, depression and coping with stress. Practice Implications In the educational processes, it is possible to focus on students' unresolved problems with their families, and the signs of codependency.