Rheumatology and Immunology is a department specializing in rheumatic diseases, which has been established in China for about 30 years, and usually has an independent department in a tertiary-level hospital. Its scope of care is mainly rheumatic and immune diseases, and its representative diseases include rheumatoid arthritis, ankylosing spondylitis, spondyloarthropathies, polymyositis, systemic vasculitis, leukemia, etc. It mainly deals with all kinds of difficult and complicated diseases. It mainly looks at a wide range of difficult diseases. If a patient has an unknown cause of fever or multiple organ damage, he or she should remember to visit the rheumatology and immunology department.