Definition

Sciatica is an irritation of the sciatic nerve. The sciatic nerve leave the spine in the low back. There is one on the left and one on the right. The nerve travels deep into the pelvis to the lower buttocks. From there, it passes down the back of each thigh. Then the nerve divides at the knee into branches that go to the feet.

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Causes

Sciatica is caused by pressure on the nerve. This can be the result of:

• Herniated disc —the cushions between the bones of your spine bulge and press on the nerve as it exits the spinal column
• Arthritis of the back—swelling in joints of the lower back
• Spinal stenosis —narrowing of the spinal canal in the lower back
• Spondylolisthesis —slippage of a bone in the lower back
• Cauda equina syndrome —nerve roots at the base of the spinal cord are compressed
• Piriformis syndrome—spasm of piriformis muscle deep in the pelvis/hip

Risk Factors

Factors that may increase your chance of sciatica include:

Personal health factors, such as:

• Obesity
• Smoking
• History of low back problems
• Anxiety and depression

Occupational factors, such as:

• Heavy manual labor
• Heavy lifting
• Exposure to vibrations
• A job that requires standing for long periods of time and forward bending

Other health conditions, such as:

• Fractures in the back
• Tumors
• Infections
• Metabolic problems, such as diabetes

Symptoms

Symptoms can range from mild to severe. Symptoms may include:

• Burning, tingling, or a shooting pain down the back of one leg
• Pain in one leg or buttock may get worse with:
  • Sitting
  • Standing up
  • Coughing
  • Sneezing
  • Straining
• Weakness or numbness in a leg or foot

More serious symptoms associated with sciatica that may require immediate medical attention include:

• Continuing weakness in a leg or foot
• Numbness in groin or the buttocks
• Difficulty walking, standing, or moving
• Loss of bowel or bladder control
• Fever, unexplained weight loss, or other signs of illness

Diagnosis

You will be asked about your symptoms and health history. A physical exam will be done. Your doctor will pay close attention to your back, hips, and legs. The physical exam will include tests for strength, flexibility, sensation, and reflexes.

Imaging tests are used to evaluate the affected area:

• X-ray
• MRI scan
• CT scan

Your doctor may also need to test your nerves. This can be done with a nerve conduction study.

Treatment

The goal of treatment is to reduce sciatic nerve irritation.

Treatment options include:

Prevention

Sciatica tends to happen more than one time. To help reduce your chance of sciatica:

• Use proper body movement when playing sports, exercising, or lifting heavy objects.
• Practice good posture to reduce pressure on your spine.
• Begin a safe exercise program with the advice of your doctor.
• If possible, avoid sitting or standing in one position for long periods.
• Consider job retraining if your work requires a lot of heavy lifting or sitting.