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Ankylosing Spondylitis

https://www.niams.nih.gov/health-topics/ankylosing-spondylitis

What is ankylosing spondylitis? Ankylosing spondylitis (AS) is a type of arthritis that affects the spine. AS often involves redness, heat, swelling, and pain in the spine or in the joint where the bottom of the spine (sacrum) joins the pelvic bone (ilium). In some people, AS can also affect the shoulders, ribs, hips, knees, and feet. It can also affect areas where the tendons and ligaments attach to the bones. Sometimes it can affect the eyes, bowel, and very rarely, the heart and lungs. Many people with AS have mild back pain that comes and goes. Others have severe