Whether fibromyalgia is an autoimmune condition has not been proven in the science. However a repeated study has interesting implications suggesting that patients with the autoimmune disorder of the thyroid, Hashimoto's Thyroiditis is at a greater risk of developing fibromyalgia. More studies are needed, however, I believe and have spoken with one of the authors of the Preliminary Proposed Diagnostic Criteria, that all FM patients should be routinely screened for thyroid antibodies, especially if they have symptoms consistent with hypothyroidism, but normal tests to check thyroid status do not reveal a problem.
Hashimoto's can cause a waxing and waning of unexplained symptoms that can be very distressing. Andectodatally, there are a great number of FM and CFS/ME patients that report having Hashimoto's. There is more on hypo metabolism and thyroid resistance in our book,
Integrative Therapies for Fibromyalgia, Chronic Fatigue Syndrome, and Myofascial Pain: The Mind-Body Connection by Celeste Cooper, RN and Jeff Miller, PhD.
Bazzichi L, Rossi A, Zirafa C, Monzani F, Tognini S, Dardano A, Santini F, Tonacchera M, De Servi M, Giacomelli C, De Feo F, Doveri M, Massimetti G, Bombardieri S. “Thyroid autoimmunity may represent a predisposition for the development of fibromyalgia?” Rheumatology International, Nov 18, 2010.
Find out more about this book:Integrative Therapies for Fibromyalgia, Chronic Fatigue Syndrome, and Myofascial Pain: The Mind-Body Connection