Sciatica refers to pain in the feet and lower body. This pain occurs mainly due to compression of the cytoplasmic vein of the body, which extends to the legs. The Sciatica nerve starts at your spine, branches downward into both feet, running through your hips and buttocks. This nerve is the longest nerve in your body and one of the most important nerves. This has a direct effect on your ability to control and feel your feet. When trouble occurs in this nerve, you experience sciatica.