Sciatica is pain that runs along your leg and often accompanies low back pain.
The sciatic nerve is a large nerve (as wide as your thumb) that is made up
of branches from the lowest part of the spinal cord (the lumbar and sacral
areas -- see step 2). The nerve travels through
the pelvis, deep below the buttocks, passing down the hip and along the back
of the thigh all the way to your foot.
If the sciatic nerve gets trapped or inflamed anywhere along this route, you
may feel pain. This is called sciatica. There are several ways that a low back
injury may press on the sciatic nerve and cause sciatica. Two common reasons
are a herniated disk and spinal stenosis (narrowing
of the spinal canal).
Sciatica can also result from a sudden injury. For example, if a buttocks
muscle is injured from running too hard or lifting too many weights, it may
swell or tighten and put pressure on the sciatic nerve causing pain.
Sciatica causes pain anywhere along the route that the sciatic nerve travels
(your buttocks, the back of your thigh, the back of your calf, and even your
foot). The sensation may be only a slight tingling or dull ache or it may be
severe enough to decrease your ability to move. Sciatica almost always affects
one leg or the other. Sometimes, however, you may have symptoms in both legs.
Review Date: 4/6/2007
Reviewed By: Benjamin D. Roye, M.D., M.P.H., Orthopaedic Surgery, The Mount Sinai Hospital, New York, NY. Review provided by VeriMed Healthcare Network.
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