The sciatic nerve originates from nerve roots in the lumbar and sacral spine (L4 through S3), merging into a single large nerve trunk that passes through the pelvis and runs down each leg. In a healthy spine, these nerve roots exit the spinal column through small openings called intervertebral foramina with ample room and no compression.
Sciatica develops when something disrupts this pathway, placing mechanical pressure on the nerve or its roots. The most common culprit is a herniated or bulging lumbar disc, which accounts for approximately 90% of sciatica cases. Chiropractic care corrects spinal misalignments that contribute to disc herniation and nerve irritation.
Spinal misalignments, degenerative disc disease, and muscle imbalances in the lower back and pelvis can also alter the biomechanics of the lumbar spine, gradually narrowing the spaces through which the sciatic nerve travels.
