Overuse of health services drives up costs while affecting quality of care. It can also harm patients physically and psychologically through invoking duplicate testing, unnecessary procedures, and psychological stress. The purpose of this study was to understand nurses' perceptions of health care overuse. Nurses perceived that physicians' main considerations when ordering tests are to get additional data to strengthen the diagnosis and "just to be safe." Fear of litigation and patients' desires were important factors. Implementing interventions to reduce overuse will create a more efficient and effective system.