A link between stress and rheumatoid arthritis (RA) is commonly acknowledged. However, scientists continue to explore the connection between the nervous and immune systems and the effect on RA onset and progression. People with RA commonly report experiencing physical or emotional stress when first diagnosed with an autoimmune disorder like RA. However in a 2010 editorial in Arthritis Research & Therapy, Daniel Clauw, MD, a professor of anesthesiology at the University of Michigan (who has expertise in rheumatology and pain), commented on a review of 16 studies on the stress-arthritis link. In his editorial, Dr. Clauw highlighted the verified link in animal models and the difficulty in proving a similar linear relationship in humans.