Sciatica

Sciatica is the name people give to pain that travels down one leg from the lower back, often along a specific path. It's one of the most commonly searched health terms on the internet, and one of the most commonly misunderstood. The word describes a symptom, not a diagnosis. Several different spine conditions can produce sciatica, and the right treatment depends on identifying which one is the source.

The good news is that most cases of sciatica improve over weeks to months without surgery, regardless of the underlying cause. The point of an evaluation isn't to rush toward a procedure — it's to confirm that nothing serious is causing the symptoms and to choose the right first step.

What sciatica actually is

The sciatic nerve is the largest nerve in the body. It's formed from several nerve roots that exit the lower spine, merge in the pelvis, and travel down the back of each leg into the foot. “Sciatica” is shorthand for pain that follows the path of this nerve or one of its contributing nerve roots — typically pain that travels from the lower back or buttock down through the back or side of the thigh, sometimes continuing into the lower leg and foot.

The pain itself isn't from the sciatic nerve being injured directly. It's almost always from a nerve root being irritated or compressed where it exits the spine, before the sciatic nerve even fully forms. The leg pain pattern reflects which nerve root is involved.

This is why the medical word for sciatica is radiculopathy — the issue is at the nerve root level. Most of the time, when a clinician evaluates “sciatica,” they're really evaluating a lumbar radiculopathy.

What's typically causing it

A handful of spine conditions account for most cases of sciatica. Each has its own evaluation and treatment considerations, and each has its own page on this site for further reading:

• Lumbar disc herniation

  The most common cause. A piece of disc presses on a nerve root, producing leg pain in the pattern of that nerve.

• Foraminal stenosis

  Bony narrowing of the small channel where a nerve exits the spine, often from arthritis or bone spurs.

• Lumbar spinal stenosis

  Narrowing of the central spinal canal, typically causing leg symptoms with walking that ease with sitting.

• Lumbar facet cyst

  A fluid-filled cyst from an arthritic facet joint pressing on a nerve.

• Spondylolisthesis

  A vertebra that has slipped forward on the one below, sometimes narrowing the space where a nerve exits.

Less commonly, sciatica can be caused by piriformis syndrome (irritation of the sciatic nerve as it passes through the buttock muscle), tumors, fractures, or other less typical sources. A careful evaluation distinguishes among these.

Why most cases improve on their own

Across the most common causes of sciatica — disc herniations especially, but also many cases of stenosis and foraminal narrowing — the natural history is generally favorable. Studies that follow people over time show that pain, leg symptoms, and often the underlying imaging findings tend to decrease over weeks to months without surgery.

The body has real capacity to resolve the inflammation around an irritated nerve, and disc material that has herniated can be partially reabsorbed over time. The first phase of treatment is usually to make this process tolerable while it happens:

• A focused course of physical therapy
• Anti-inflammatory medication when appropriate
• Activity modification — staying active without aggravating the nerve
• An epidural steroid injection in selected cases
• Time, in most cases

Most patients see meaningful improvement within six to twelve weeks. Some take longer. The decision about whether to wait, escalate non-surgical care, or move toward a surgical evaluation depends on how the symptoms are tracking and how much they are affecting daily life.

When evaluation makes sense

Evaluation by a spine specialist is reasonable when:

• Leg pain has persisted beyond several weeks despite a real trial of non-surgical care
• Pain is severe or limiting daily function
• There is weakness in the leg or foot, particularly if it is progressing
• Symptoms have a clear pattern but the underlying cause hasn't yet been identified
• You'd like a clearer plan than waiting and hoping

A few situations warrant urgent evaluation regardless of how long symptoms have been present: rapidly worsening weakness, loss of bladder or bowel control, or numbness in the area you would sit on. These can suggest serious nerve compression and should be assessed immediately.

What an evaluation looks like

The evaluation usually starts with a careful history and examination. Where exactly does the pain travel? What makes it worse? Is there weakness? The pattern of symptoms often suggests which nerve is involved before any imaging is reviewed.

If imaging is appropriate, an MRI of the lumbar spine is the most common study. The MRI is then read against the symptoms and exam — not in isolation. Many imaging findings (mild disc bulges, minor degenerative changes) are common in people who have no symptoms at all, and not every abnormality on a report is the cause of the pain. Aligning the imaging with the exam is what makes the diagnosis useful.

When surgery is part of the conversation

For the smaller share of people whose sciatica doesn't improve enough with non-surgical care, surgery is sometimes the right next step. The specific procedure depends on the underlying cause — the page for each condition (linked above) describes the surgical options for that diagnosis.

What's true across causes is that the less invasive approaches available today, particularly endoscopic techniques, mean the conversation about surgery looks different than it did a generation ago. Many sciatica-causing problems that previously required substantial surgery can now be addressed through small-incision procedures with shorter recoveries.

Choosing what's right for you

If you're working through sciatica and trying to understand what's happening — or you've been managing it on your own for a while and want a clearer picture before deciding what to do next — an evaluation is a reasonable starting point. The goal is to identify the source, give you an honest read on how it's likely to behave, and outline the options if and when they become relevant.

Endoscopic spine surgery is the focus of my practice. If you'd like a thoughtful workup of your sciatica and an honest conversation about whether or not surgery is part of the picture for you, I'd be glad to talk through it at an appointment.