Multi-center Registration Study of Adult Onset Still's Disease in Chinese Population

Inclusion Criteria: * AOSD: Patients fulfill Japan's Yamaguch AOSD classification. * Control: Use 1:1 group matching, should meet the following condition -s : same gender as matching case; same age as matching case or the difference ranges within 1 year; no Immune related diseases (e.g. Psor -iasis, Systemic Lupus Erythematos -us, Dermatomyositis, Scleroderma, Rheumatoid Arthritis, Type 1 Diabet -es, Behcet's disease, Sjogren's Syndrome, Hyperthyroidism, etc.); no family history of immune related diseases. Exclusion Criteria: * Anyone with physical or mental illness that may affect the assessment will be excluded, such as patients with hearing or speech expression disorders.