Dr. M. Regina Castro, MD

Medical Editor

Mayo Clinic The Essential Diabetes Book

Area of Expertise

  • Diabetes
  • Graves’ disease
  • Hyperthyroidism
  • Hypothyroidism
  • Thyroid cancer
  • Thyroid disease
  • Thyroid nodule


Dr. Castro, medical editor of Mayo Clinic’s The Essential Diabetes Book, 2nd Edition, is a consultant in endocrinology at Mayo Clinic in Rochester, MN since 2003. She completed her endocrinology fellowship at Mayo Clinic Rochester in 1999. She is Professor in Medicine, and a member of the Thyroid Disease and Diabetes Core Groups for the Division of Endocrinology at Mayo Clinic. She combines clinical work, residents and fellows’ education and clinical research. Her primary clinical interest is the evaluation and treatment of all thyroid disorders (Hyperthyroidism, hypothyroidism, thyroid nodules and thyroid cancer). Her research interest is in the management of patients with thyroid nodules and cancer, and the application of novel non-surgical approaches to the treatment of benign thyroid nodules, including the use of percutaneous ethanol injection (PEI) and radiofrequency ablation (RFA). She is a member of the American Thyroid Association where she has served on the Board of Directors and currently serves as President of Women in Thyroidology. She has been Chair of the Patient Affairs and Education Committee and the Diversity, Equity and Inclusion Task Force. She is also the Medical Editor of diabetes related content at mayoclinic.org.

Rochester, MN

Maria Castro