Sciatica is pain caused by irritation or pressure against the nerve
roots of the sciatic nerve. People with sciatica usually have a shooting pain
down the back of the leg. But they also may have leg weakness, tingling, or
The sciatic nerve is formed by the nerve roots coming out of the
spinal cord into the lower back (lumbar region). The nerve goes down through the buttock, then its branches extend down the back of the leg to the
ankle and foot.
Sciatica is usually caused by a bulging or ruptured (herniated)
spinal disc that presses against one or more of the nerve roots that form the
sciatic nerve. Pregnancy is also a common cause of the condition. Bone spurs
(from arthritis or spinal stenosis), compressed nerve roots (usually a result
of an injury), and certain rare tumors may also cause sciatica.
Symptoms may become worse from sitting, prolonged standing, or
moving in ways that flex the spine (such as curl-ups and knee-to-chest
exercises). Symptoms can also become worse from increased pressure from sneezing, coughing, having a bowel
movement, or straining for a heavy lift or while laboring to deliver a baby. Symptoms may be relieved by walking, lying down, and moving in ways that extend the
spine (such as press-ups).
Treatment depends on what is causing the nerve irritation. Heat or
cold therapy (applying ice or a cold pack to the lower back) or physical
therapy is often used to help relieve pain.
March 12, 2012
William H. Blahd, Jr., MD, FACEP - Emergency Medicine & Robert B. Keller, MD - Orthopedics
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