Usually the joints where the spine joins the pelvis are also affected. Eye and bowel problems may also occur. Pain in the back is a typical symptom of AS, and it often comes and goes. Stiffness of the affected joints usually gets worse over time.
- "Questions and Answers about Ankylosing Spondylitis". NIAMS. June 2016. Archived from the original on 28 September 2016. Retrieved 28 September 2016.
- "Ankylosing spondylitis". GARD. 9 February 2015. Archived from the original on 2 October 2016. Retrieved 28 September 2016.