mixed connective tissue disease: Mixed connective tissue disease (MCTD) is a rare autoimmune disorder that is characterized by features commonly seen in three different connective tissue disorders: systemic lupus erythematosus , scleroderma , and polymyositis . Some affected people may also have symptoms of rheumatoid arthritis . Although MCTD can affect people of all ages, it appears to be most common in women under age 30. Signs and symptoms vary but may include Raynaud's phenomenon ; arthritis; heart, lung and skin abnormalities; kidney disease; muscle weakness, and dysfunction of the esophagus. The cause of MCTD is currently unknown. There is no cure but certain medications such as nonsteroidal anti-inflammatory drugs (NSAIDs) , corticosteroids and immunosuppresivedrugsmay help manage the symptoms.

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