What Causes Sciatica?

Sciatica can be caused by:

  • Lumbar disc herniation pressing a nerve root
  • Spinal stenosis (narrowing of the central or lateral canal where nerve roots pass) from degenerative disc disease
  • Piriformis syndrome:  pinching of the sciatic nerve by the piriformis muscle— one of the hip mover muscles
  • Pelvic mass (tumor, cyst)
  • Third trimester pregnancy
  • Prolonged sitting; direct, continuous pressure on the sciatic nerve
  • Brain tumor affecting the cell nuclei of sciatic nerve motor neurons in the brain


NEXT:  The Three, Main Presentations of Sciatica

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