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.
Other causes of sciatica include muscle inflammation, infection, or injury, such as a fracture. In general, any condition that irritates or compresses the sciatic nerve can trigger symptoms. In some cases, no specific cause of sciatica can be found.