Depends: This will depend on the location of the disc herniation. In the lumbar area, where the spinal canal is largest, a 2-3mm bulge is not worrisome. In the cervical spine, however, where the canal is much smaller, a 2-3 mm bulge can cause compression of the spinal cord or nerve root. Your doctor can tell you whether the changes are significant.
Answered 1/15/2014
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