- Ankylosing Spondylitis from the Spondylitis Association of America
- Arthritis information from the Mayo Clinic. Updated
- Arthritis FAQ from the CDC Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health.
- Arthritis Foundation
- Arthritis Society of Canada
- Foreningen af Unge med Gigt (FNUG) [Danish Organisation of Youth with Rheumatism]
- Gigforeningen [Danish Arthritis Society]
- International League of Associations for Rheumatology (ILAR)
- International Organisation of Youth with Rheumatism (IOYR)
- Italian Society for Rheumatology [Italy]
- National Axial Spondyloarthritis Society [UK] Axial Spondyloarthritis (axial SpA) is an inflammatory arthritis where the main symptom is back pain. Axial spondyloarthritis is an umbrella term and it includes
- Ankylosing Spondylitis (AS) Where changes to the sacroiliac joints or the spine can be seen on x-ray.
- Non-radiographic axial spondyloarthritis Where x-ray changes are not present but inflammation is visible on MRI or you have symptoms.
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