Sciatica or Piriformis Syndrome? How to Tell the Difference and Why It Matters

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Quick Answer: Sciatica originates from nerve compression in the lumbar spine (usually a herniated disc), while piriformis syndrome involves the piriformis muscle in the buttock compressing the sciatic nerve. The distinction is critical because the treatments are different — and treating the wrong one wastes time and money.

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The Problem With Being Told You Have “Sciatica”

If you’ve been told you have sciatica, you’ve been given a symptom description, not a diagnosis. “Sciatica” simply means pain along the sciatic nerve pathway — it doesn’t tell you why that nerve is being irritated.

This matters enormously because the two most common causes of sciatic nerve pain — lumbar disc herniation and piriformis syndrome — require fundamentally different treatment approaches. I see patients regularly who’ve been treated for the wrong one, sometimes for months, getting nowhere.

In my Salt Lake City practice, roughly 15-20% of patients referred to me for “sciatica” actually have piriformis syndrome or deep gluteal syndrome as their primary pain generator. Proper differential diagnosis at the first visit changes their entire trajectory.

Understanding the Anatomy

True Sciatica (Lumbar Radiculopathy)

The sciatic nerve originates from nerve roots L4 through S3 in the lumbar spine. When a herniated disc or bone spur compresses one of these nerve roots as it exits the spine, you get true sciatica — pain radiating from the lower back through the buttock and down the leg.

The compression happens at the spine, and the symptoms radiate downward along the nerve’s pathway.

Piriformis Syndrome

The piriformis muscle runs from the sacrum (base of the spine) to the top of the femur (thigh bone), deep in the buttock. The sciatic nerve passes directly beneath this muscle — and in roughly 17% of the population, the nerve actually passes through the piriformis (Smoll, Clinical Anatomy, 2010).

When the piriformis muscle spasms, tightens, or swells, it can compress the sciatic nerve right there in the buttock — producing pain that radiates down the leg in a pattern nearly identical to lumbar disc-related sciatica.

The compression happens at the buttock, not the spine.

Key Differences: How to Start Telling Them Apart

Pain Location and Pattern

True sciatica (disc-related):

• Usually starts in the lower back and radiates down
• Often follows a specific dermatomal pattern (L5 nerve root → outside of the leg to the big toe; S1 → back of the leg to the little toe)
• Pain may extend all the way to the foot
• Low back pain is usually present alongside leg pain

Piriformis syndrome:

• Usually starts in the deep buttock
• Pain may not involve the low back at all
• Radiates down the back of the thigh, sometimes to the calf
• Rarely extends below the knee (though it can)
• Deep, aching quality in the buttock rather than sharp/shooting

Aggravating Factors

True sciatica:

• Worse with sitting (increases disc pressure)
• Worse with bending forward, coughing, sneezing
• Worse in the morning after prolonged bed rest
• Often has a positional component — changes with lumbar spine position
• May improve with walking (in some cases)

Piriformis syndrome:

• Worse with prolonged sitting (compresses the piriformis against the nerve)
• Worse with crossing legs
• Worse with climbing stairs or walking uphill
• Worse with activities involving hip rotation (getting in/out of car)
• May be aggravated by running, especially on uneven terrain
• Often relieved by standing and walking on flat ground

Response to Position Changes

True sciatica:

• Symptoms change with lumbar spine positions (flexion vs. extension)
• A McKenzie assessment reveals a directional preference
• Prone press-ups or extension exercises often centralize symptoms

Piriformis syndrome:

• Lumbar movements don’t significantly change leg symptoms
• No clear directional preference on McKenzie testing
• Hip stretching and piriformis-specific maneuvers reproduce or relieve symptoms

Self-Tests You Can Try at Home

Important disclaimer: These self-tests can give you clues, but they cannot replace a professional assessment. They’re a starting point — not a diagnosis.

Test 1: Prone Press-Up Test (For True Sciatica)

1. Lie face down on a firm surface
2. Place your hands by your shoulders as if doing a push-up
3. Press your upper body up while keeping your hips on the surface
4. Repeat 10 times

What it means:

• If your leg pain decreases or moves closer to your back → suggests lumbar disc involvement (centralization), pointing toward true sciatica
• If no change in leg pain → less likely to be disc-related

Learn more about this in my McKenzie exercises guide.

Test 2: FAIR Test (For Piriformis Syndrome)

1. Lie on your back
2. Bend your affected hip and knee to 90 degrees
3. Have someone gently push your knee toward the opposite shoulder while rotating your foot outward (or do this passively against a wall)
4. Hold for 30-60 seconds

What it means:

• If this reproduces your buttock and/or leg pain → suggests piriformis involvement
• This position stretches the piriformis and compresses it against the sciatic nerve

Test 3: Straight Leg Raise (General Nerve Tension)

1. Lie on your back with both legs straight
2. Have someone slowly raise your affected leg, keeping the knee straight
3. Note the angle at which pain begins and where you feel it

What it means:

• Pain between 30-70 degrees that reproduces your leg symptoms → positive for nerve irritation (could be either cause)
• Pain only in the hamstring → likely just tight hamstrings, not nerve involvement

Test 4: Seated Piriformis Test

1. Sit on a firm chair
2. Cross your affected leg over the other knee (figure-4 position)
3. Gently lean forward

What it means:

• Deep buttock pain that may radiate down the leg → suggests piriformis involvement
• If this position doesn’t reproduce your symptoms → piriformis is less likely

What the Research Says

Distinguishing piriformis syndrome from lumbar radiculopathy remains challenging even for experienced clinicians. Hopayian et al. (European Spine Journal, 2010) conducted a systematic review and concluded that piriformis syndrome is diagnosed primarily through clinical examination — there is no definitive imaging test.

Key findings from the literature:

• MRI of the lumbar spine can confirm disc herniation but cannot rule out concurrent piriformis syndrome
• MRI of the piriformis may show asymmetric enlargement or inflammation but has limited sensitivity
• EMG/nerve conduction studies can help identify the level of nerve compression but are uncomfortable and not always conclusive
• Diagnostic injection of the piriformis under ultrasound guidance is considered the most definitive test for piriformis syndrome — if injecting the piriformis with local anesthetic abolishes your symptoms, the diagnosis is confirmed

In clinical practice, I rely primarily on the McKenzie assessment and clinical examination rather than imaging. The response to specific movements and positions tells me more than most imaging studies.

Why the Distinction Matters for Treatment

Treatment for True Sciatica (Disc-Related)

The McKenzie Method is the gold standard in my practice:

• Directional preference exercises — usually extension-based (prone press-ups, standing extension)
• Centralization of symptoms through repeated movements
• Progressive loading as symptoms improve
• Postural education to reduce disc loading
• Dry needling of paraspinal muscles when muscle guarding prevents McKenzie progression

The goal is to address the disc mechanics directly and reduce nerve root compression at the spinal level.

Treatment for Piriformis Syndrome

A fundamentally different approach:

• Piriformis-specific stretching and mobilization — but not aggressive stretching, which can irritate an already inflamed muscle
• Dry needling of the piriformis — often the most effective single intervention, as the muscle sits too deep for most manual techniques
• Hip strengthening — particularly the gluteus medius and external rotators, which reduce compensatory load on the piriformis
• Activity modification — addressing the biomechanical factors that overloaded the piriformis (running form, sitting habits, training errors)
• Neural mobilization — gentle nerve gliding techniques to reduce sciatic nerve sensitivity

What Happens When You Treat the Wrong One

If you treat piriformis syndrome with McKenzie extension exercises: The exercises won’t hurt, but they won’t help your leg symptoms. You’ll get frustrated and think physical therapy doesn’t work. Meanwhile, the piriformis continues to compress the nerve.
If you treat disc-related sciatica with piriformis stretching: You might get temporary relief (stretching feels good), but the underlying disc problem continues unchecked. The sciatica may worsen over time because the actual cause isn’t being addressed.
If you treat both simultaneously without understanding which is primary: You dilute your treatment and can’t determine what’s helping. This shotgun approach is common and rarely effective.

Can You Have Both?

Yes — and this is more common than most clinicians acknowledge.

A lumbar disc herniation can cause sciatica through direct nerve compression at the spine. But the resulting nerve irritation and gait changes can also cause secondary piriformis spasm, creating a second point of nerve compression in the buttock.

When I suspect both are contributing, I address them sequentially:

1. McKenzie first — treat the disc component and see how much the leg symptoms improve
2. If residual buttock/leg pain persists after the spinal component has been addressed → treat the piriformis
3. Dry needling the piriformis while continuing McKenzie exercises for the lumbar spine

This layered approach ensures I’m not chasing the wrong problem and can clearly identify each pain generator.

A Patient Story

Sarah, a 32-year-old trail runner, came to me after seeing another physical therapist for six weeks for “sciatica.” She’d been given stretches for sciatica and core exercises with no improvement in her deep buttock pain and posterior thigh pain.

Her previous therapist had treated her based on an MRI showing a small L5-S1 disc bulge. But here’s the thing — small disc bulges are incredibly common and often asymptomatic. The MRI finding didn’t necessarily mean it was causing her symptoms.

My McKenzie assessment revealed no directional preference. Lumbar extension, flexion, and lateral movements produced no change in her leg symptoms. This was a major clue — true disc-related sciatica almost always has a directional preference.

When I examined her piriformis, it was exquisitely tender and reproduced her exact pain pattern. The FAIR test was strongly positive. She’d increased her trail running mileage by 40% in the two months before symptoms started — a classic piriformis syndrome trigger.

I dry needled her piriformis at the first visit. The twitch responses were dramatic. Within 24 hours, her posterior thigh pain had reduced by 50%. Over four sessions of dry needling, hip strengthening, and running form modification, her symptoms resolved completely.

Six weeks of treating the wrong diagnosis versus four weeks of treating the right one. The assessment made all the difference.

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Frequently Asked Questions

Can an MRI tell me if I have piriformis syndrome?

Standard lumbar MRI cannot diagnose piriformis syndrome — it only shows lumbar structures. A dedicated hip/pelvis MRI may show piriformis asymmetry or inflammation, but the sensitivity is limited. Piriformis syndrome remains primarily a clinical diagnosis based on physical examination.

Does piriformis syndrome show up on nerve conduction tests?

Sometimes. EMG/nerve conduction studies may show sciatic nerve irritation at the piriformis level versus the lumbar spine level. However, results are often inconclusive, and many clinicians — myself included — find clinical examination more useful for distinguishing the two conditions.

Can stretching make piriformis syndrome worse?

Aggressive stretching can worsen an acutely inflamed piriformis. If the muscle is in spasm due to overuse or nerve irritation, forceful stretching can increase inflammation and compression. Gentle, progressive stretching combined with targeted treatments like dry needling is more effective.

How long does piriformis syndrome take to heal?

With proper treatment (dry needling, hip strengthening, activity modification), most patients see significant improvement within 3-6 weeks. Chronic cases — especially those misdiagnosed and mistreated for months — may take 6-8 weeks. Addressing contributing factors like running form and sitting habits is essential for preventing recurrence.

Can piriformis syndrome cause numbness in the foot?

It can, though this is less common than with disc-related sciatica. If the piriformis is compressing the sciatic nerve significantly, you may experience numbness or tingling in the foot. If you’re developing progressive numbness or weakness, seek evaluation promptly — see red flags guide.

Should I stop running if I have piriformis syndrome?

Not necessarily, but you likely need to modify your training. Reducing mileage, avoiding hills temporarily, and focusing on running form can allow healing while maintaining fitness. A complete stop isn’t always required — I work with each runner to find the right balance between recovery and activity.

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Book your evaluation online or call/text (385) 332-4939. No referral needed — Utah’s direct access law lets you come directly to me.

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Emily Warren, DPT, is the owner of Mindful Movement Physical Therapies in Salt Lake City. She holds a Diploma in the McKenzie Method (MDT) and specializes in differential diagnosis of spinal and peripheral nerve conditions, including sciatica and piriformis syndrome.

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