Ankylosing Spondylitis (AS) is a chronic inflammatory arthritis that predominantly affects the axial skeleton in adolescent patients causing spinal pain and stiffness. There is a marked delay, on ...

Welcome, everyone. I'm Dr. John Whyte, the chief medical officer at WebMD. Ankylosing spondylitis is a type of arthritis that causes pain and stiffness in your spine. It usually starts in your ...