Your Dr probably said "undifferentiated connective tissue disease", more commonly known as UCTD. This means you have symptoms and signs of an auto-immune connective tissue disease, but not enough specific indications to indicate which specific disease it might be.
"Connective-tissue diseases (CTDs) manifest with a wide range of clinical findings and laboratory abnormalities. The diversity of signs and symptoms frequently complicates the diagnosis of these diseases, which includes rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), systemic sclerosis (SSc), polymyositis (PM), dermatomyositis (DM), mixed connective-tissue disease (MCTD), and Sjögrens syndrome (SS)."
All of these diseases above tend to respond to Prednisone as it decreases inflammation. One of they ways Drs determine whether Fibro is present is that Fibro pains and symptoms generally DO NOT respond to prednisone, yet prednisone will give you relief from the auto-immune diseases listed above.
There are differences in how Lupus and Scleroderma develop over time. Sclerdoderma, as I understand it, is more in the body tissues making us inflexible - like making the lungs hard and thus difficult to breathe, while Lupus is more organ-involving. There are a lot of overlap in the symptoms, and initially treatment is the same for both auto-immune diseases.
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & HW's LUPUS 101
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Post Edited (Lynnwood) : 6/30/2015 1:33:53 PM (GMT-6)