What is the difference between rheumatism and rheumatoid disease?

Rheumatoid disease refers to a large class of diffuse connective tissue disease in addition to rheumatoid arthritis, while rheumatoid arthritis refers to a large class of rheumatic diseases mainly manifested in joints. Rheumatology is a major class of diseases, at present clinical including in the category of rheumatism diseases, has been close to 200 kinds, rheumatoid arthritis we clinical refers to rheumatoid arthritis, rheumatoid arthritis is one of our rheumatic diseases, but also we see a large class of rheumatism, its main feature is can show joint symptoms and extra-joint symptoms. Most of the patients seek medical treatment, are mainly joint pain, swelling, symmetry of a performance, it includes in our rheumatic disease a small class of diseases, but also we see a representative of rheumatism, rheumatism and rheumatoid arthritis and a major difference is what? Rheumatoid disease in addition to rheumatoid arthritis, it refers to a large class of diffuse connective tissue disease, such as our systemic lupus erythematosus, Sjogren's syndrome, systemic sclerosis and so on this large class of diseases, but also our common rheumatic diseases, and rheumatoid arthritis, specifically refers to rheumatic diseases with joints as the main manifestation of a large class of diseases.