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.
If they become damaged and start to bulge out between the bones of your lower back, they can press on your sciatic nerve roots and cause sciatica. Symptoms of sciatica may include: 1  Lower back pain. 2  Shooting pain down the back of the leg. 3  Burning leg and back pain. 4  Tingling and numbness of the back or leg.