![]() Sciatica can also be caused by narrowing of the nerve tunnel between discs due to osteoarthritis. Most cases of sciatica resolve by themselves within six weeks to three months. This pressure irritates the nerve, causing referred pain. In sciatica, prolapsed or 'slipped' discs tend to bulge and press on the intervertebral nerve(s). The sciatic nerve controls sensation and function to the leg and foot. It passes from the spine into the buttock, then into the back of the thigh and leg. These nerve roots pass out between the disc spaces and join up to form the sciatic nerve. ![]() The sciatic nerve is a large nerve, formed from nerve roots that originate from the spinal cord. When your leg goes to sleep, that is also a form of sciatica. Sciatica can be brought on by sitting on a hard seat. ![]() It can be produced by pressure on the nerve, where it passes through the buttock. Sciatica is nerve pain arising from the sciatic nerve.
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