You get sciatica by a spinal nerve's being irritated, once or over a period of time. You may develop sciatic leg pain due to many different conditions
singly or in combination: stenosis, disc herniation, facet syndrome, etc. Sometimes the spinal nerve is mechanically irritated by a disc herniation, pressing into the spinal canal or chemically irritated by disc material that finds its way into the canal where it isn't supposed to be.
Sometimes you can recall a specific incident that caused your leg pain to begin, but more often, you can't point to one event. A lifetime of small events often accumulate to result in sciatica due to poor posture, too much heavy lifting, extra pounds of weight. These stresses build up to one day when a normal thing like bending to pick up the newspaper results in shooting pain to foot.
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page. Content is reviewed by Dr. James M. Cox I