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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.
The symptoms of ankylosing spondylitis can get worse over time. The pain and stiffness may begin in your lower back, but can later spread to other joints in your body. Without treatment, AS can make your back stiffer and joints in your spine can fuse together.