Ankylosing spondylitis is a chronic inflammatory disease affecting the spine and sacroiliac joints. Persistent inflammation can trigger new bone growth between vertebrae, leading to spinal fusion, or ...

In severe AS, spinal fusion can occur and other body parts can be affected. Therapies and medications can help you manage symptoms. Treatments to reduce your immune response can help prevent further ...

Ankylosing spondylitis (AS) is an inflammatory disease that affects the joints and bones of the spine. The condition is one of the best-known forms of spondyloarthritis, or arthritis of the spine.

Ankylosing spondylitis (AS) inflames the lower back joints, causing buttock pain and stiffness. Over time, new bone growth can fuse vertebrae into a “bamboo spine,” limiting movement. AS can also ...