Steven Sandberg-Lewis, ND, DHANP

Adjunct Faculty
  • Focus: Gastroenterology
  • Education: National College of Natural Medicine, ND, 1978

Steven Sandberg-Lewis, ND is a practitioner of Naturopathic gastroenterology. He has been in practice for 40 years and in 1996 he joined the full-time faculty of the National University of Natural Medicine (NCNM) in Portland, Oregon. Now adjunct faculty, he continues to engage in patient care 3 days per week and is a key professor in the Gastroenterology Block Course and teaches several electives including Gastroenterology Laboratory, Advanced Gastroenterology and The Liver in Health and Disease. Dr. Sandberg-Lewis supervises the Gastroenterology Mentor Shift, giving student doctors the chance to work with complex digestive disorders in an off-campus small practice setting. Areas of special clinical and research focus include irritable bowel syndrome, SIBO, GERD, hiatal hernia, inflammatory bowel disease (including microscopic colitis), biliary dyskinesia, the sterolbiome, gastroparesis and chronic nausea/vomiting.

He is a frequent presenter at educational seminars around the U.S. and beyond. He has authored or co-authored multiple articles, webinars and is frequently interviewed on digestive health topics. He has a regular column entitled “Functional Gastroenterology Bolus” in the Townsend Letter.

Sandberg-Lewis is the author of the textbook entitled Functional Gastroenterology: Assessing and Addressing the Causes of Functional GI Disorders (written in 2017). He and his family have also created a comic book explaining SIBO.

View Dr. Sandberg-Lewis’ Curriculum Vitae


  • Gastroenterology Block
  • Gastroenterology Lab
  • Advanced Gastroenterology
  • The Liver in Health and Disease