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The low back pain is often a long time coming on as the muscles in the back gradually tighten up due to bad posture and overuse.
These muscles go into spasm and do not get enough blood through them resulting in weakness. So when someone complains of low back pain when they bend down to pick up a piece of paper and tear a muscle in the back, it is not just the piece of paper that caused it but a gradual build up of tension over weeks and months.
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