1. Connective tissue disease is a group of autoimmune diseases involving multiple systems, multiple organs and multiple autoantibodies.
 2. The etiology of connective tissue disease is not clear and may be related to genetic and environmental factors. It is a disease caused by the interaction of multiple factors.
 3. Connective tissue disease can occur everywhere in the body. Multiple systems (skin, joints, muscles, heart, kidney, hematopoietic system, central nervous system, etc.) can be involved simultaneously or locally.
 4. The symptoms and signs of connective tissue disease vary greatly, including finger swelling, arthralgia, muscle pain, dysphagia, abdominal distension, etc.
 5. Connective tissue disease is generally symptomatic treatment and control of disease development, the main treatment is drug therapy.
 6. Connective tissue disease can seriously affect the quality of life if heart damage and kidney damage occur.
 7. Connective tissue disease has a slow course and is difficult to cure.