Rheumatoid Arthritis in overlap is when RA is found with other autoimmune diseases or chronic illness.
RA is often found in overlap with other connective tissue diseases such as scleroderma, lupus, and polymyositis/dermatomyositis. It can also be found with other diseases such as thyroiditis, fibromyalgia, and sjogren's. (Also see What is Scleroderma?, Lupus, Dermatomyositis/Polymyositis, Thyroid Diseases, Fibromyalgia, Sjogren's, and Overlap Syndromes/MCTD/UCTD)
Diabetes mellitus (DM) risk factors in rheumatoid arthritis (RA): a systematic review and meta-analysis. RA is associated with increased risk of DM, including T1DM and T2DM. PubMed, Clin Exp Rheumatol, 2014 Dec 22. (Also see Symptoms and Complications of Diabetes)
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