After having Crohn's for 38 years, I've just discovered my arthritis flareups in my hands are related to Crohn's. I started seeing a rheumatologist for arthritis 6 months ago and he was savvy to Crohn's being related to my artritis issues as well as years of low back pain. He increased my dosage of Methotrexate and the side issues have gotten much better. None of my GI doctors ever mentioned symptoms other than the digestive tract so I never related these problems.