Rheumatic diseases primarily refer to diseases occurring in the musculoskeletal system (joints, muscles, ligaments, etc.), and also include systemic and chronic inflammation caused by autoimmune reactions. Although there are over 100 types of diseases, representative diseases include rheumatoid arthritis, ankylosing spondylitis, gout, lupus, Behçet's disease, systemic sclerosis, and Sjögren's syndrome.
Rheumatology is the department that provides internal medical care and treatment for these diseases.