Can back pain be associated with IBS or Diverticulitis?

UNLIKELY. However the pain from a POSTERIOR PERFORATION ("blowout") of a Diverticula could produce pain referred to the lower back! (I have never personally seen this but it is technically possible! Hope this helps! Dr Z.

Related Questions

Does diverticulitis cause back pain?

Yes. Yes it can, though typically the pain is in the abdomen. Read more...
It can. Cause acute back pain in addition to abdominal pain, particularly if the associated inflammatory changes reach towards to posterior(back) musculature. It usually isn't the most prominent symptom though. Read more...