This study is ground breaking in my opinion---compiled over 30 years--it shows the connection between stress-related disorders and an increased risk for autoimmune disease.  There is a connection between stress and autoimmune! 

June 19, 2018
News releases & journal articles from the JAMA Network
Journal of the American Medical Asssocation

Bottom Line: Stress-related disorders brought on by traumatic or stressful life events were associated with increased risk of developing an autoimmune disease.

Why The Research Is Interesting: Development of stress-related disorders such as posttraumatic stress disorder (PTSD) may influence multiple bodily systems, including immune function. Whether this contributes to risk for autoimmune disease remains unclear.

Who and When: 106,464 patients in Sweden diagnosed with stress-related disorders between 1981-2013 and compared with 126,652 of their siblings and nearly 1.1 million individuals without stress-related disorders.

What (Study Measures and Outcomes): Diagnosis of stress-related disorders, such as PTSD, acute stress reaction, adjustment disorder and other stress reactions (exposures); development of 41 autoimmune diseases, such as rheumatoid arthritis, psoriasis, Crohn disease and celiac disease (outcomes)

How (Study Design): This was an observational study. Researchers were not intervening for purposes of the study and cannot control all the natural differences that could explain the study findings.

Authors: Huan Song, M.D., Ph.D., University of Iceland, Reykjavik, and coauthors

Results: A stress-related disorder was associated with an increased risk of a subsequent autoimmune disease compared with siblings and other individuals without stress-related disorders.

Study Limitations: Diagnoses from primary care aren’t included in a Swedish patient register, which could result in fewer stress-related disorders and autoimmune diseases being detected, particularly when the conditions are less severe.

Study Conclusions: More studies are needed to understand possible reasons behind the association of stress-related disorders and the development of autoimmune diseases.

Full Study with References>
Journal of the American Medical Asssocation