Hi, Lorcan:

Yes, it is AS but You have posed a chicken-and-egg situation where an egg-and-chicken would explain it just fine.

AS does not cause IBS/colitis.
AS is caused by IBS/colitis, so they are intimately linked.

Most people with AS will never notice their bowel involvement; the increased permeability is difficult to recognize as is their incipient/early IBS.

bon appetit,
John

Important AS Resources

Professor Ebringer: On Diet and AS;


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