Written by Dr. Sam McDonald, DC (Colorado Chiropractic License CHR.0007574), Omega Functional Health.

If you have pain running down one leg, you have probably heard more than one explanation for it, sometimes in the same week. One provider says you have sciatica. Another says you have a herniated disc. A third looks at your imaging, tells you it looks reasonably normal for your age, and is not sure why you are still hurting.

Those are not really competing opinions. They are different kinds of statements, and the confusion between them is one of the reasons leg pain so often gets partly treated for months.

Is Sciatica a Diagnosis?

Not exactly. Sciatica describes pain that travels along the path of the sciatic nerve, typically from the low back or buttock, down the back of the thigh, and sometimes past the knee into the calf or foot. It describes where the pain goes. It does not say what is producing it.

In that sense, saying “I have sciatica” is closer to saying “I have a headache” than it is to naming a cause. It is useful information, it points toward a region and a nerve, but it is the beginning of the question rather than the answer.

What a Herniated Disc Actually Is

The discs between your vertebrae have a tough outer ring and a softer interior. When some of that inner material pushes outward past its normal boundary, it gets described as a bulge, a protrusion, or a herniation, depending on how far it has moved and what shape it takes.

A herniated disc can irritate a nearby nerve root in two different ways: mechanically, by taking up space the nerve needs, and chemically, through the inflammatory response around the displaced material. That second mechanism is part of why the size of a herniation on imaging does not reliably predict how much pain a person is in. Small findings sometimes hurt considerably. Large ones are sometimes quiet.

Why the Two Terms Get Used Interchangeably

Disc herniation is the single most common cause of true nerve-root sciatica, and clinical reviews generally attribute the majority of radicular presentations to it. So the shorthand is not unreasonable. It is just incomplete, and the gap matters most for the people whose pain does not follow the expected path.

What Else Can Produce the Same Leg Pain?

Several things can create a similar pattern, and they call for meaningfully different care:

• Deep gluteal involvement. The sciatic nerve passes through the deep hip rotators, including the piriformis. Tension, trigger points, or scarring in that region can irritate the nerve well below the spine.
• Lumbar spinal stenosis. More typical in older adults, often worse with standing and walking, and frequently eased by leaning forward or sitting.
• Sacroiliac joint referral. The joint between the pelvis and the sacrum can refer pain into the buttock and upper thigh in a pattern people reasonably read as sciatica.
• Gluteal and hamstring myofascial pain. Trigger points in these muscles can refer pain down the leg without involving the sciatic nerve at all.

These can also overlap. It is entirely possible to have a disc finding on imaging and a significant deep gluteal contribution at the same time, which is one reason treating only the more visible of the two tends to produce partial results.

What Imaging Can and Cannot Tell You

This is the part that surprises most people. A large systematic review of imaging in people with no symptoms at all found disc bulges in roughly 30 percent of 20-year-olds, rising to about 84 percent by age 80, with disc degeneration present in 37 percent of asymptomatic 20-year-olds and nearly all 80-year-olds.

That does not make imaging useless. It means a herniation on your scan is a real finding that may or may not be the thing producing your particular pain, and it needs to be matched against your examination rather than read on its own. It also means a clean scan does not mean nothing is wrong. It means the problem is not one that this type of imaging shows well.

A Different Question: Why Has This Not Settled Down?

Most sciatica improves. Bodies are generally good at resolving nerve irritation, and a large share of cases settle within the first several weeks without anything dramatic being done.

So when leg pain has been going on for months, the more useful question is not “how bad is it” or “which medication manages it best.” It is: what is keeping your body from resolving this the way it usually would? That is the question the Omega Method is built around, and it points toward different information than a pain scale does.

What May Be Maintaining It

Local tissue that has not resolved. Scarring, poor tissue quality, or persistent trigger points in the deep gluteal muscles, the piriformis, or the hamstring origin can keep irritating the nerve and keep the region sensitized long after the original event.

Whole-body load patterns. The body distributes load as a connected system. A pattern established somewhere else, an old ankle injury, a hip that never fully recovered, a long-standing asymmetry in how you sit or stand, can change how force moves through the pelvis and low back. When that is part of the picture, treating only the painful side tends to give relief that keeps unwinding.

How you have been moving since it started. People with leg pain adopt a protective gait quickly and often keep it long after the acute phase has passed. That adapted pattern can keep loading the same tissue in the same way, which is worth assessing rather than assuming.

How We Determine What Is Actually Driving Your Sciatica

We test before we treat. For leg pain, that generally includes orthopedic and neurological testing to establish whether a nerve root is genuinely involved, including strength, reflex, and sensation screening; assessment of hip and pelvic mechanics; hands-on examination of the deep gluteal structures; and a look at how you distribute load when you stand and walk.

The point of that sequence is simple. Two people can arrive with nearly identical imaging and need quite different care, and the examination is what separates them.

A Personalized Approach

Care follows the Omega Method: Discover what testing actually shows, Decode what that combination means in your specific case, Direct a plan built around those findings rather than a standard protocol, and Develop it over time as retesting shows what is responding.

Does This Replace Traditional Medical Care for Sciatica?

No. Some presentations need urgent medical attention, and this is one area where that matters a great deal. Progressive weakness in the leg or foot, a foot that catches or drops when you walk, numbness in the saddle region, or any change in bladder or bowel control requires immediate evaluation rather than a conservative care plan.

Surgical consultation is also entirely appropriate for some people, particularly where there is significant or worsening neurological involvement. What we offer is a different assessment lens, most useful for people whose workup has not explained why the pain is persisting.

Who This May Help

• Adults with leg pain that has continued beyond the first several weeks
• People told they have a herniated disc whose symptoms have not matched the expected recovery course
• People whose imaging came back unremarkable while the leg pain continued
• Those whose pain sits mainly in the buttock and upper thigh rather than following a clear nerve-root pattern
• Anyone who has had partial relief from care aimed only at the low back

What Does the Research Say?

A 2019 clinical review in The BMJ summarizes the diagnosis and management of sciatica, noting that the prognosis is generally favorable for most people while a meaningful minority continue to have symptoms well beyond the expected window.

The 2015 systematic review of imaging in asymptomatic populations, published in the American Journal of Neuroradiology, is the source of the prevalence figures above and is a useful check on how much weight any single imaging finding should carry.

A 2013 systematic review in the European Journal of Pain examined which factors predict outcome in people with sciatica treated without surgery, and found the evidence base for individual predictors to be limited, which is itself a reason to measure rather than assume.

This research is informative rather than conclusive. Study designs and populations vary considerably, and none of it predicts what will happen in an individual case.

What This Approach Does and Does Not Claim

We do not claim to correct disc herniations, and we cannot promise a particular outcome. What examination can do is distinguish between the several different problems that all present as pain down the leg, and build care around the one you actually have.

If Your Leg Pain Has Outlasted the Explanation

If you have been given a label without a plan that worked, or the pain has simply gone on longer than anyone expected, the useful next step is finding out which of these patterns is actually present. Every case is different and we cannot promise a specific result, but we can tell you what we find and build care around it. Omega Functional Health serves Wheat Ridge, Denver, Arvada, Lakewood, Golden, Littleton, and surrounding Colorado communities.

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References

• Jensen RK, Kongsted A, Kjaer P, Koes B. Diagnosis and treatment of sciatica. BMJ. 2019;367:l6273. doi:10.1136/bmj.l6273
• Brinjikji W, Luetmer PH, Comstock B, et al. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations. American Journal of Neuroradiology. 2015;36(4):811-816. PMID: 25430861
• Verwoerd AJH, Luijsterburg PAJ, Lin CWC, Jacobs WCH, Koes BW, Verhagen AP. Systematic review of prognostic factors predicting outcome in non-surgically treated patients with sciatica. European Journal of Pain. 2013;17(8):1126-1137. doi:10.1002/j.1532-2149.2013.00301.x