Sciatica occurs due to the irritation of the root(s) of the lower lumbar and lumbosacral spine. Other common causes of sciatica include: Muscle spasm in the buttocks or back, Pregnancy, Lumbar spinal stenosis (spinal canal narrows in your lower back), e.t.c. Call Advanced Health Solutions – GA Spine & Disc now at (770) 212-3991 if you need Woodstock sciatica pain treatment.