> Yet approximately 90% of patients with CLBP cannot identify any clear specific cause or origin of their pain.
Same here.
More than once in my life I seemed to not feel any pain unless my injury get to the point of damage preventing proper physical operations.
It feels like I was doing something wrong and didn't get feedback from my body until it was too late.
Learning from this article about correlation between lower back pain and with lower brain volumes in pain-related brain areas strikes home.