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According to the [[National Insititute of Arthritis and Musculoskeletal and Skin Diseases]], "one type of arthritis, osteoarthritis, is often related to aging or to an injury. Other types occur when your immune system, which normally protects your body from infection, attacks your body's own tissues. Rheumatoid arthritis is the most common form of this kind of arthritis. Juvenile rheumatoid arthritis is a form of the disease that happens in children."<ref>http://www.nlm.nih.gov/medlineplus/arthritis.html</ref>  

According to the [[National Insititute of Arthritis and Musculoskeletal and Skin Diseases]], "one type of arthritis, osteoarthritis, is often related to aging or to an injury. Other types occur when your immune system, which normally protects your body from infection, attacks your body's own tissues. Rheumatoid arthritis is the most common form of this kind of arthritis. Juvenile rheumatoid arthritis is a form of the disease that happens in children."<ref>http://www.nlm.nih.gov/medlineplus/arthritis.html</ref>  

Other types of atrhritis are Psoriatic Arthritis and lupus. In lupus arthritis is one symptom of a severe disease.

Other types of athritis are Psoriatic Arthritis and lupus. In lupus arthritis is one symptom of a severe disease.

==References==

==References==