The schemas are a set of 'types', each associated with a set of properties. The types are arranged in a hierarchy.he schemas are a set of 'types', each associated with a set of properties. The types are arranged in a hierarchy.
Inadequate stretching and warming up prior to exercise, or advancing your exercise program too quickly, or beginning a new exercise program, have all been known to cause symptoms. In some people, just vigorous walking or exercising on uneven ground is enough to exacerbate a flare-up of sciatica nerve pain.
A bulging or herniated disc is the most common cause of sciatica. As the disc bears down on the sensitive nerve (usually affecting the L4/L5 or L5/S1 levels), it restricts blood flow and important nutrients from reaching all sections of the sciatic nerve through the lower back, hips, buttocks and down each leg.