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The sciatic nerve is the longest nerve in your body, stretching from the end of your spine all the way down to your feet. When it gets pinched, it can cause pain anywhere along its length (lower back on one side, in the lower buttock, or down one leg).
Sciatica is something that can hang around for months or may just disappear. It is not uncommon for it to come back, but it could also be years before it does so.