Steven Sandberg-Lewis, ND DHANP



Dr. Steven Sandberg-Lewis has been a practicing naturopathic physician for nearly 40 years, previously on Orcas Island in Washington and for many years exclusively at the National College of Natural Medicine (NCNM) Teaching Clinic. His areas of specialty include:

● Gastro-intestinal conditions, including inflammatory bowel disease (IBD – including microscopic colitis), irritable bowel syndrome (IBS), Small Intestine Bacterial Overgrowth (SIBO), gastroesophageal and bile reflux (GERD), biliary dyskinesia, and chronic nausea

● Chronic sinusitis and infections

● Clearing of unresolved emotional states

● Spinal manipulation and soft tissue techniques – including structural integration and visceral manipulation

Dr. Sandberg-Lewis receives referrals of patients with digestive diseases who desire naturopathic treatment options; and often these are conditions that have defied diagnosis by other physicians. He understands the diseases of the gastrointestinal tract, but also can assess function and often find successful treatments to regain normal function of the digestive system.

He also focuses on the influence of stress on the body’s physiology. Using soft tissue techniques such as structural integration, he effectively addresses injuries, post-surgical problems, and chronic pain by increasing blood flow and facilitating flexibility to affected areas. Visceral manipulation of the abdomen allows him to solve structural digestive problems often unaddressed by other healthcare providers. His expertise in physical medicine also includes releasing spinal restrictions and malpositions using naturopathic manipulative therapy. He refers patients to other practitioners for extensive abdominal and pelvic adhesion treatment.

In addition to supervising clinical rotations at the NCNM Clinic, as a full-time faculty member, Dr. Sandberg-Lewis teaches several academic gastroenterology courses at NCNM. He also lectures frequently at medical seminars, presents webinars and is frequently interviewed on issues of digestive health and disease. In 2014, he was named one of the “Top Docs” in Portland monthly magazines yearly healthcare issue. He is the author of the medical textbook Functional Gastroenterology: Assessing and Addressing the Causes of Functional Digestive Disorders, 2nd Ed., 2017. You can find this textbook at 8 Hearts.

Dr. Sandberg-Lewis lives in Portland with his wife, Kayle. His interests include mandolin, guitar, and voice, as well as writing and lecturing.



The 2nd ed. of Dr. Sandberg-Lewis’s textbook

Functional Gastroenterology

has been published! Click HERE for more information.



(NEW) The Sterolbiome – The Essential, But Overlooked Enterohepatic Endocrine System (2019)
Early Life and GI Flora (2018)
Collagen, Joint Hypermobility, Digestion, and Psychology (NEW) (2018)
Understanding Chronic Nausea and Gastroparesis (2018)
The Grey Areas in GI Health and Disease (2018)
Helicobacter Pylori – Commensal, Pathobiont, or Pathogen (2017)
An Expanded View of Transaminases and New ACG Normal Values (2017)
Gut-Brain Communication: Major Mechanisms in Mental-Emotional Health and Disease (2017)
The Liver, Thyroid, & METS (2016)
Dysbiosis Has A New Name (2015)
SIBO: The Finer Points of Diagnosis, Test Interpretation, and Treatment (2014)
Small Intestine Bacterial Overgrowth: Common But Overlooked Cause of IBS (2013)
Hiatal Hernia Syndrome (2009)
Proton Pump Inhibitors: For Better or Worse? (2008)
Autoimmune Disease and the GI Tract (2008)
Addressing Traumatic Brain Injury (2007)
Primary Raynaud Phenomenon (2001)


PHONE: (503) 894-9118
FAX: (503) 894-7398



Episode 61: Causes for Refractory SIBO w/ Dr. Steven Sandberg-Lewis