Sciatica describes persistent pain felt along the sciatic nerve, which runs from the lower back, down through the buttock, and into the lower leg. The sciatic nerve is the longest and widest nerve in the body, running from the lower back through the buttocks and down the back of each leg. It controls the muscles of the lower leg and provides sensation to the thighs, legs, and the soles of the feet.

Although sciatica is a relatively common form of low-back and leg pain, the true meaning of the term is often misunderstood. Sciatica is actually a set of symptoms—not a diagnosis for what is irritating the nerve root and causing the pain.

Sciatica occurs most frequently in people between the ages of 30 and 50 years old. Most often, it tends to develop as a result of general wear and tear on the structures of the lower spine, not as a result of injury.

What are the symptoms of sciatica?

The most common symptom associated with sciatica is pain that radiates along the path of the sciatic nerve, from the lower back and down one leg; however, symptoms can vary widely depending on where the sciatic nerve is affected. Some may experience a mild tingling, a dull ache, or even a burning sensation, typically on one side of the body.

Some patients also report:

• A pins-and-needles sensation, most often in the toes or foot
• Numbness or muscle weakness in the affected leg or foot

Pain from sciatica often begins slowly, gradually intensifying over time. In addition, the pain can worsen after prolonged sitting, sneezing, coughing, bending, or other sudden movements.

How is sciatica diagnosed?

Your doctor of chiropractic will begin by taking a complete patient history. You’ll be asked to describe your pain and to explain when the pain began, and what activities lessen or intensify the pain. Forming a diagnosis will also require a physical and neurological exam, in which the doctor will pay special attention to your spine and legs. You may be asked to perform some basic activities that will test your sensory and muscle strength, as well as your reflexes. For example, you may be asked to lie on an examination table and lift your legs straight in the air, one at a time.

In some cases, your doctor of chiropractic may recommend diagnostic imaging, such as x-ray, MRI, or CT scan. Diagnostic imaging may be used to rule out a more serious condition, such as a tumor or infection, and can be used when patients with severe symptoms fail to respond to six to eight weeks of conservative treatment.