Summary: Sciatica isn’t a diagnosis. It’s a description of a symptom, pain radiating along the path of the sciatic nerve, and several very different conditions produce it, including lumbar disc herniation, spinal stenosis, piriformis syndrome, and spondylolisthesis. Because each of those requires a different treatment approach, identifying which one you have is what determines whether treatment works. A small number of symptoms, including bowel or bladder changes with numbness in the groin, constitute a genuine emergency. At MAPS, sciatica treatment begins with pinpointing the source of the compression rather than treating the leg pain generically.

If you’ve got pain shooting down the back of your leg, you probably already know the word for it. What most patients don’t realize is that sciatica functions more like the word “fever,” it tells you something is happening without telling you why. Two people with identical leg pain can have entirely different problems requiring entirely different treatments. Here’s how to think about what might be driving yours.

Sciatica Is a Symptom, Not a Diagnosis

Why That Distinction Matters for Treatment

The sciatic nerve is the largest nerve in the body, formed from nerve roots exiting the lower spine and running through the buttock and down the leg. Anything that compresses or irritates that nerve, or the roots feeding it, produces sciatica. The compression could be at the spine, in the pelvis, or somewhere along the path.

This matters because treatment targets the compression, not the pain. An epidural injection that works beautifully for a herniated disc does nothing for a nerve being compressed by the piriformis muscle in the buttock. Stretching that relieves piriformis syndrome can aggravate a disc herniation. Getting the source right isn’t a technicality, it’s the whole thing.

What Compresses the Sciatic Nerve

Lumbar Disc Herniation

The most common cause, particularly in patients under 50. When the soft inner material of a spinal disc pushes through its outer wall, it can press directly on an adjacent nerve root. Pain often begins suddenly, sometimes after lifting or a specific movement, and typically worsens with sitting, bending forward, coughing, or sneezing, all of which increase pressure on the disc.

Spinal Stenosis

More common in patients over 60. Narrowing of the spinal canal, usually from arthritic changes, bone spurs, and thickened ligaments, compresses nerves as they pass through. The distinguishing pattern is positional: symptoms worsen with standing and walking, and improve with sitting or leaning forward. Patients often notice they can walk much further leaning on a shopping cart than upright.

Piriformis Syndrome

Here the compression happens outside the spine entirely. The piriformis muscle sits deep in the buttock, and the sciatic nerve runs beneath or through it. When that muscle is tight, spasming, or inflamed, it can compress the nerve directly. Pain typically centers in the buttock, worsens with prolonged sitting, and is often reproduced by pressing on that spot. Because there’s no spinal problem to find, patients with piriformis syndrome frequently have normal spine imaging and get told nothing is wrong.

Spondylolisthesis and Other Structural Causes

Spondylolisthesis occurs when one vertebra slips forward relative to the one below it, narrowing the space nerves pass through. Other contributors include degenerative disc disease, facet joint arthritis with bone spur formation, sacroiliac joint dysfunction referring pain into a similar distribution, and less commonly, a tumor or cyst pressing on the nerve.

How to Recognize True Sciatica

The Pain Pattern That Follows the Nerve

True sciatica follows a recognizable path: from the lower back or buttock, down the back or side of the thigh, and often below the knee into the calf or foot. Pain that stops at the buttock or upper thigh may be referred from the hip or sacroiliac joint rather than sciatic in origin. Pain extending below the knee is a reasonably reliable indicator of genuine nerve root involvement.

Sciatica also almost always affects one side. Bilateral symptoms warrant closer attention, both because they suggest a different mechanism and because they can signal something more serious.

Numbness, Tingling, and Weakness

Beyond pain, nerve compression commonly produces numbness or tingling along the same distribution. Muscle weakness is more significant: difficulty lifting the foot, weakness pushing off with the toes, or a foot that catches when walking indicates meaningful nerve involvement that shouldn’t be monitored indefinitely.

Red Flags Requiring Urgent Care

Most sciatica is not an emergency. A small number of presentations are, and they’re worth knowing precisely.

Seek immediate emergency care for:

• Loss of bowel or bladder control, or new difficulty urinating
• Numbness in the groin, genitals, or inner thighs, the area that would contact a saddle

Sudden, severe weakness in both legs

• Rapidly progressing weakness in either leg

These can indicate cauda equina syndrome, compression of the bundle of nerve roots at the base of the spinal cord. It’s rare, but it’s a surgical emergency where hours matter for preserving function. Don’t wait for an appointment.

Also seek prompt evaluation for sciatica following significant trauma, or accompanied by fever or unexplained weight loss.

Why Identifying the Source Determines the Treatment

A proper evaluation examines which movements and positions reproduce your symptoms, maps their exact distribution against specific nerve root territories, tests strength and reflexes in the leg, and assesses the piriformis and sacroiliac joint alongside the lumbar spine. Imaging helps evaluate structure, though findings need interpreting against your symptoms, since disc changes appear commonly in people with no pain at all.

Diagnostic injections can settle the question directly. Numbing a specific nerve root or structure and observing whether your pain resolves provides evidence about the actual source rather than an inference from imaging.

Sciatica Treatment Options at MAPS

Treatment follows from the diagnosis. For disc-related radicular pain, epidural steroid injections reduce inflammation around the compressed nerve root, often providing substantial relief and creating a window for physical therapy to work. For stenosis, similar approaches apply alongside activity modification. For piriformis syndrome, targeted injections into the muscle combined with specific stretching and strengthening address the actual compression. For sacroiliac joint involvement, joint injections or medial branch blocks are appropriate, with radiofrequency ablation available for pain that keeps returning.

Physical therapy plays a role in nearly all of these, since addressing the mechanics that contributed to the problem is what keeps it from recurring. Our approach is non-opioid throughout, and for the back pain that frequently accompanies sciatica, we treat both together rather than in isolation.

Schedule a Sciatica Evaluation

If your leg pain hasn’t responded to treatment, it may be that the wrong source is being treated. Our double board-certified, fellowship-trained physicians identify exactly where the compression is occurring before recommending treatment. Schedule a consultation with MAPS Centers for Pain Control at any of our 8 Chicagoland locations.