Overview of Occupational and Environmental Medicine By Michael I Greenberg, MD, Drexel University College of Medicine; David Vearrier, MD, MPH, University of Mississippi Medical Center Reviewed / Revised May 2022 | Modified Sep 2022 View Patient Education Patient Evaluation Workplace Safety Evaluation Disability Assessment Testing Treatment and Return to Work Preemployment Screening Worker Screening and Surveillance More Information Topic Resources Hierarchy of Controls Types of Workplace Hazards Occupational and environmental medicine (OEM) focuses on prevention, diagnosis, and treatment of occupation - and environment-related injuries and illnesses.