I am intrigued by kct and lower back pain appearing often together.

1. Can you confirm please?
I am talking about the pain below the kidneys. Lumbar region.

2.I wonder if conditions such as Ankylosing Spondylitis( chronic degenerative condition with lower back pain are also commonly go together with ktc?

3. The lower back pain seems to be ongoing and during stress phase although it is cerebral medulla and therefore should be appear in the regeneration phase? That's what's confusing me.