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The normal X-ray means there is no injury to the bone or any changes of degeneration in bone but that does not help to locate the problem.Back pain
can be due to tiredness
after work;calciumdeficiency and even a disc prolapse
which can be seen on a MRI scan and not on X-ray.In any case please start on a multivitamin
and calcium tablets and see you will feel better for support you can occassionally take a pain killer also.