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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 condition can lead to complications affecting not just the spine, but the eyes and heart. At least half a million Americans have ankylosing spondylitis (AS), a painful and sometimes debilitating arthritis of the spine. Most people with the condition experience lower back pain and stiffness, but AS can be unpredictable and lead to a range of other complications affecting different parts of the body.