Can tight psoas muscle cause lower (lumbar) back pain? If yes, which exercise would be best to recover? Thanks.
How do you differentiate if the pain in lower back is because of tight psoas or due to locked facet joint (No neurological problem)?
EXTRA (if it seems relevant to question): This pain also seems to sometime transfer to hip and tail bone, and as per the MRI and X-ray reports there's no disk or nerve pinching problem I've had ~10 MRIs and 10 X-rays and all show no problem in spine or joint. Though there's inflammation in hip (it was in SI joint as well, but now it is not). It seems to me now that it is probably a muscle related problem.