Ankylosing spondylitis (AS) is a type of chronic (long-term) arthritis that affects parts of the spine, including bones, muscles and ligaments.
Our Health A-Z contains more information on Ankylosing spondylitis.
Back pain is very common and normally improves within a few weeks or months.
Our Health A-Z contains more information on Back pain.
Important: If you have these symptoms, they may be unrelated to any of these conditions listed. If you are concerned about your symptoms then you should see a doctor.