Fumio Otsuka has been a professor in the Department of General Medicine, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, since 2012, and was an associate professor in the Endocrine Center, University Hospital of Medicine and Dentistry, Okayama University, from 2009 to 2012. Additionally, he was a research fellow at UCSD from 1999 to 2002. His areas of activity revolve around internal medicine, endocrinology, rheumatology, and laboratory medicine.