Welcome to Connect, @mjgarr. I moved your message to this existing discussion about microscopic colitis in the Digestive Health group so that you can meet other members talking about MC. According to this article from Mayo Clinic, autoimmune diseases such as rheumatoid arthritis or celiac disease may cause microscopic colitis http://mayocl.in/2bmyFqr Here's additional information from the National Institute of Health https://www.niddk.nih.gov/health-information/health-topics/digestive-diseases/microscopic-colitis/Pages/facts.aspx

Do you also have an autoimmune condition?