Sciatica isn't a diagnosis. It's a description.

Root Physical Therapy

Clinical Note — No. 08

Spine & Nerve

Sciatica isn't a diagnosis.
It's a description.

"Sciatica" tells you where it hurts — down the back of the leg — and nothing about why. Naming the actual cause is what separates the treatment that works from the six months of guessing. And for most people, the path out doesn't run through an operating room.

Georgetown, Seattle10 min readEvidence-based

Written by the Doctors of Physical Therapy at Root Physical Therapy — on-site inside Root Strength, Georgetown. Leg pain that shoots, burns, or tingles is one of the most common reasons people walk through our door. If this sounds like yours, book an assessment — no referral needed in Washington.

Somewhere between the search bar and the exam room, "sciatica" became a disease. People arrive having been told they have it, the way you have strep throat — a thing with one cause and one cure. And the internet obliges, offering the three stretches, the one weird trick, and eventually, the surgeon.

Here's the correction that changes everything downstream: sciatica is a symptom, not a diagnosis. It describes pain traveling along the territory of the sciatic nerve — buttock, back of the thigh, sometimes past the knee into the calf or foot. It's the leg-pain equivalent of "headache." Useful as a description; useless as a treatment plan, because several different problems can produce it, and they don't all respond to the same care.

One

Is it actually nerve pain?

Before asking what's irritating the nerve, it's worth confirming a nerve is involved at all. True nerve-root pain — what clinicians call radicular pain — has a recognizable character:

The Signature of Nerve-Root Pain

Figure 01

i

Leg pain worse than back pain — often the back barely registers at all

ii

Pain below the knee, following a fairly consistent line down the leg

iii

A distinctive quality — shooting, burning, electric, or a deep toothache-like ache, rather than dull muscle soreness

iv

Numbness, tingling, or pins-and-needles in part of the leg or foot

v

Provoked by sitting, coughing, or sneezing — things that load or tension the nerve

vi

Sometimes weakness — the foot slaps, the calf won't push off, the toes drag on a curb

Plenty of leg pain isn't this. The sacroiliac joint, the hip, and the hamstring can all refer pain into the buttock and thigh convincingly — usually a duller ache that stays above the knee, without the electric quality or the numbness. These "imposters" respond to completely different treatment, which is reason enough to get the question answered rather than assumed.

Two

The usual suspects

If it is nerve pain, something is irritating that nerve somewhere along its path. In practice the list is short:

What's Actually Irritating the Nerve

Figure 02

I

Disc herniation — the classic

The most common cause in adults under 50. Part of a lumbar disc pushes into the space where a nerve root exits, and the combination of compression and — importantly — inflammation irritates the root. The inflammatory part matters: it's a large reason symptoms can calm down dramatically while the disc itself is still visible on a scan.

II

Stenosis — the space got smaller

More common after 50: arthritic changes gradually narrow the canal or the exit tunnels (foramina) the nerves pass through. The tell is often the pattern — worse with standing and walking, eased by sitting or leaning forward, like on a shopping cart. Almost the mirror image of the disc pattern.

III

Deep gluteal irritation — the nerve pinched past the spine

Sometimes the nerve is irritated not at the spine but in the buttock, where it passes under and between deep hip muscles — what used to be lumped together as "piriformis syndrome." Buttock-dominant pain, worse with sitting on it, tender locally, usually without the spine-loading pattern. Less common than the internet suggests, but real.

IV

The imposters — leg pain with an alibi

SI joint, hip joint (including arthritis and labral irritation), hamstring tendinopathy, and myofascial referral can all mimic sciatica from a distance. This is the category where "sciatica stretches" from a video do nothing — because the sciatic nerve was never the problem.

Different suspects, different plans. A disc-driven leg pain, a stenosis pattern, and a deep gluteal irritation each want different positions, different exercises, and different progressions. This is why "treatment for sciatica" is the wrong question — the right one is "treatment for what's causing yours."

Three

The numbers nobody tells you in the panic

Sciatica can be genuinely severe — for some people it's the worst pain they've had. Severity does terrible things to our sense of prognosis: the worse it hurts, the more damaged we assume we must be. The data says otherwise, in three ways.

The Reassuring Numbers

Figure 03

29%

of pain-free 20-year-olds have a disc protrusion on MRI — findings and pain are not the same thing

~66%

of lumbar disc herniations shrink or resorb on their own — and larger ones regress more often

1–2 yrs

after which trial outcomes for surgery and conservative care largely converge

Sources: Brinjikji's systematic review of imaging in asymptomatic people; the Zhong meta-analysis of spontaneous disc resorption; and the randomized surgery-vs-conservative trials (see Sources). That middle number deserves a second look: your body actively cleans up herniated disc material. Immune cells treat the displaced fragment as something to remove — and counterintuitively, the bigger extrusions resorb at the highest rates.

Put together: a scan finding is not a life sentence, the herniation itself is frequently temporary, and the natural course of most disc-related sciatica is substantial improvement over weeks to a few months — with active, well-managed conservative care as the vehicle, not passive waiting.

The disc is not a crushed structure. It's an irritated one — and irritation resolves.

Four

What the evidence supports

The guidelines here are unusually unanimous. First-line care for sciatica without red flags is active, non-surgical management: staying as active as symptoms allow, targeted exercise, education about the condition's course, and short-term pain control as needed to keep you moving. Bed rest — the historical prescription — was tested in a randomized trial and failed: two weeks of it produced no better outcomes than continuing ordinary activity. The spine does not reward stillness.

Routine early imaging isn't recommended either, for exactly the reason in Figure 03: with so many pain-free spines showing bulges and protrusions, an early MRI mostly generates alarming vocabulary without changing the plan. Imaging earns its place when red flags appear, when significant weakness is progressing, or when symptoms have failed a genuine course of conservative care and a procedure is actually being considered. (This is the argument our MRI article makes at full length.)

The honest case for surgery — stated plainly

Discectomy works, and for the right person it works fast. In the major randomized trials comparing early surgery with prolonged conservative care for confirmed disc herniation with matching symptoms, surgery relieved leg pain faster — meaningfully so. For someone with severe, function-destroying pain or progressive weakness, that speed is a legitimate reason to operate.

The nuance is what happens next: by one to two years, the groups largely converge. Most people randomized to conservative care ended up as well off as the surgical group — and a large share never needed the operation at all. That's why conservative-first isn't a PT sales pitch; it's the guideline position. Surgery for sciatica is mostly a decision about time, made with full information — not a rescue from a spine that couldn't heal.

Five

The protocol — what PT actually does

Here's what a course of care looks like at Root PT. As always: five pillars, sequenced by what the assessment finds — because a stenosis pattern and a disc pattern get nearly opposite programs.

The Five Pillars

Figure 04

I

Assessment — name the suspect, screen the flags

A neurological exam (strength, sensation, reflexes) to establish a baseline and rule out anything urgent, then movement testing to identify the driver — including directional preference: many disc-driven presentations have movements that reliably improve the leg pain and movements that worsen it. Finding yours turns treatment from generic to targeted on day one.

II

Calm the nerve — positions, dosage, and staying in motion

Irritated nerves are dose-sensitive. We find the positions and movements that give the nerve room and the leg relief, adjust sitting, sleeping, and work setups that are feeding the irritation, and keep you as active as the symptoms genuinely allow — because the evidence is unambiguous that rest is not treatment.

III

Restore the nerve's tolerance to movement

Nerves are mobile structures — they slide and stretch as you move. Once irritability is trending down, graded nerve-mobility work and progressively restored bending, sitting, and hinging teach the system that these movements are safe again, before fear has a chance to make the guarding permanent.

IV

Rebuild capacity — the hips, trunk, and legs

The long-term insurance policy: progressive strengthening of the hips, trunk, and legs so load is shared across a robust system rather than concentrated on a sensitized segment. This is where the on-site gym is the treatment — real load, coached hinging and lifting, progressed on schedule rather than left as a handout.

V

Return fully — and make the next episode less likely

A graded return to everything the leg pain took — lifting, running, sport, sitting through a flight — plus a plan for flare-ups, because sensitized nerves can grumble on the way out. Knowing the difference between a flare and a setback is what keeps one bad week from undoing three good months.

Honest timelines: nerve pain usually improves in weeks, but full resolution — especially of lingering numbness or tingling — can trail the pain by months. Nerves heal slowly. They do heal.

The reframe that helps most

Sciatica is a nerve that's irritated, not a spine that's broken. The pain is loud because nerves are loud — it's their job to be. Loudness is not damage. The people who do best with this condition are the ones who keep moving within tolerance, treat the actual driver, and give the nerve the one thing it genuinely needs: time under progressively normal conditions.

Go to urgent care or the ER — not PT — if you have

These are rare, but they are emergencies of nerve function, and hours matter:

Numbness in the groin or inner thighs (saddle area)

New trouble controlling bladder or bowels — retention or incontinence

Rapidly progressing leg weakness or a new foot drop

Symptoms in both legs at once

Leg pain after significant trauma

Fever, unexplained weight loss, or a history of cancer with new spine pain

Six

The bottom line

"Sciatica" is where the conversation starts, not where it ends. It's a description of leg pain with several possible causes — most commonly an inflamed nerve root from a disc that, in two-thirds of cases, your own immune system is already dismantling. The evidence-supported path is an accurate assessment, movement matched to your specific pattern, and a progressive rebuild — with surgery held in reserve as a deliberate, well-informed decision about speed, not an inevitability.

And the thing to do first is simple: get the symptom examined and named. Everything effective follows from that.

The Short Version

• Sciatica is a symptom, not a diagnosis — pain along the sciatic nerve's territory, with several possible causes.
• True nerve pain has a signature: leg worse than back, pain below the knee, electric quality, numbness or tingling, worse with sitting, coughing, sneezing.
• The usual suspects: disc herniation, stenosis, deep gluteal irritation — and imposters like the SI joint, hip, and hamstring.
• Scan findings ≠ pain: 29% of pain-free 20-year-olds have a disc protrusion on MRI.
• ~66% of herniations shrink or resorb on their own — and larger ones regress more often.
• Bed rest failed its trial. Staying active within tolerance is the treatment, not the risk.
• Surgery buys speed, not a better destination — outcomes largely converge with conservative care by 1–2 years. It's a real option for severe pain or progressive weakness, made best with full information.
• Saddle numbness or new bladder/bowel changes = emergency. ER, not PT, not tomorrow.

This article provides general educational information and is not medical advice or a substitute for individual assessment. Leg pain has many causes, and any red-flag symptom warrants immediate medical attention.

Stop treating the word. Treat the cause.

The Doctors of Physical Therapy at Root PT will examine your leg pain, name what's driving it, and build the plan around that — with a full gym on-site in Georgetown. No referral required in Washington, most major insurance accepted — and we verify your benefits before scheduling, so there are no surprises.

Book an Assessment

Keep Reading — Root Physical Therapy

Do You Actually Need an MRI for Back Pain? Hurt vs Harm: Why Pain Doesn't Always Mean Damage Knee Pain Going Down Stairs — and Why the Knee Is Rarely the Problem What Actually Happens at Your First PT Appointment

Sources

1. 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.
2. Zhong M, Liu JT, Jiang H, et al. Incidence of spontaneous resorption of lumbar disc herniation: a meta-analysis. Pain Physician. 2017;20(1):E45–E52.
3. Chiu CC, Chuang TY, Chang KH, et al. The probability of spontaneous regression of lumbar herniated disc: a systematic review. Clinical Rehabilitation. 2015;29(2):184–195.
4. Peul WC, van Houwelingen HC, van den Hout WB, et al. Surgery versus prolonged conservative treatment for sciatica. New England Journal of Medicine. 2007;356(22):2245–2256.
5. Weinstein JN, Tosteson TD, Lurie JD, et al. Surgical vs nonoperative treatment for lumbar disk herniation: the Spine Patient Outcomes Research Trial (SPORT). JAMA. 2006;296(20):2441–2450.
6. Vroomen PC, de Krom MC, Wilmink JT, et al. Lack of effectiveness of bed rest for sciatica. New England Journal of Medicine. 1999;340(6):418–423.
7. National Institute for Health and Care Excellence. Low back pain and sciatica in over 16s: assessment and management. NICE Guideline NG59. 2016 (updated 2020).
8. Ostelo RWJG. Physiotherapy management of sciatica. Journal of Physiotherapy. 2020;66(2):83–88.
9. Konstantinou K, Dunn KM. Sciatica: review of epidemiological studies and prevalence estimates. Spine. 2008;33(22):2464–2472.