<<Disclaimer: Verify this information before applying it to your situation.>> Muscle and joint pains are common in untreated celiac disease and often get better with a strict gluten free diet. The diagnosis of fibromyalgia is somewhat difficult as it is not very well defined from a pathological view point unlike celiac disease which is. I am unaware that the muscle joint complaints are caused by a nutritional deficiency, though that is possible. Certainly the general malnutrition that is occassionally seen in celiac disease may casue muscle wasting. Vit D def. may cause muscle pain and weakness and is fairly common in newly diagnosed celiac disease. If the person has longstanding CD then the most important thing from the celiac disease point of view is to determine if the gut damage has healed and to see if there is any deficiency state. Other diseases of affecting the musculo skeletal system may be more common in a patient with celiac disease including Lupus, sgojren's syndrome and arthritis of various types. This is not medical advice. Joe Murray Univ of Iowa