Hi, Ankylosing spondylitis is an inflammatory disease that, over time, can cause some of the small bones in your spine (vertebrae) to fuse. This fusing makes the spine less flexible and can result in a hunched-forward posture. If ribs are affected, it can be difficult to breathe deeply. Although this disorder mainly affect spine, but it can also involve patients' eye, heart, or other joints. You need go to see a rheumatologist for systematic examination.