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Ankylosing Spondylitis (AS) is a type of progressive arthritis that leads to chronic inflammation of the spine and sacroiliac joints. It can also affect other joints and organs in the body, such as the eyes, lungs, kidneys, shoulders, knees, hips, heart, and ankles.
Causes In ankylosing spondylitis (AS) several parts of the lower spine become inflamed, including the bones in the spine (vertebrae) and spinal joints. Over time this can damage the spine and lead to the growth of new bone.