01
Why your back hurts
The spine is built to move and built to carry load. Pain shows up when the demand placed on it stops matching the capacity it has, usually because the demand is monotonous rather than because it is heavy. Eight hours seated, a weekend of yard work, one aggressive session after a quiet month.
That is why the scan so often disappoints people. Discs bulge in plenty of backs that never hurt. What separates the back that hurts from the one that does not is rarely the picture. It is the tissue tolerance underneath it and the variety of positions it sees in a week.
So the question worth asking is not "what is damaged". It is "what has this back been asked to do, and what has it stopped being able to do".
