Almost every week a patient arrives at the clinic saying "I have sciatica" - and about a third of the time, on examination, they don't.
What they have is piriformis syndrome.
The two conditions can both produce pain in the buttock radiating down the leg, but their causes and correct treatment are quite different.
Getting the diagnosis right matters because the same exercises that help one make the other worse.
Here's how we differentiate, and what each one needs.
Sciatica - nerve root compression
Sciatica in the strict sense is a symptom of a lumbar nerve root problem.
The L4, L5, or S1 nerve root is irritated, usually by a disc herniation, spinal stenosis, or less commonly a spondylolisthesis.
The sciatic nerve itself isn't the problem - the problem is further up, at the spine.
Typical presentation:
- Pain radiates from the lower back or buttock down the leg, sometimes to the foot.
- Follows a specific dermatome (strip of skin served by one nerve root).
- Worse with sitting, coughing, sneezing, or straining (anything that increases disc pressure).
- Often accompanied by numbness, tingling, or weakness in the corresponding muscle groups.
- Straight-leg raise test positive - lifting the affected leg to around 30–60° reproduces the leg pain.
Piriformis syndrome - nerve irritation below the spine
The piriformis muscle sits deep in the buttock. The sciatic nerve passes under (and in 15% of people, through) this muscle.
When the piriformis is tight, inflamed, or in spasm, it can directly compress the sciatic nerve - producing leg pain that feels like sciatica but isn't caused by a spinal problem.
Typical presentation:
- Pain focused deep in the buttock rather than the lower back.
- May radiate down the back of the thigh, occasionally to the calf - but rarely to the foot.
- Worse with sitting (especially on hard surfaces), climbing stairs, or direct pressure on the buttock.
- Often triggered by a change in running volume, prolonged driving, or cycling.
- Pain on palpation of the piriformis muscle (deep in the mid-buttock).
- FAIR test positive - flexion-adduction-internal-rotation of the hip reproduces symptoms.
- Straight-leg raise may be slightly positive but not as dramatically as with true sciatica.
The distinguishing features at a glance
| Feature | Sciatica (nerve root) | Piriformis syndrome |
|---|---|---|
| Pain origin | Lower back or glute-sacrum | Mid-buttock |
| Pain travel | Often to foot | Usually stops at knee or calf |
| Dermatome pattern | Yes | No |
| Worse with cough/sneeze | Yes (important tell) | No |
| Worse with sitting on hard surface | Some | Very much yes |
| Numbness/tingling | Common | Less common |
| Muscle weakness in leg | Common | Rare |
| Straight-leg raise | Strongly positive | Mildly positive or normal |
| MRI findings | Disc, stenosis, etc. | Often normal |
Why it matters: different treatments
For true sciatica:
- Spinal decompression through positional work - often McKenzie extension protocol.
- Nerve glides/flossing for the irritated root.
- Core and glute strengthening to offload the disc.
- Avoid aggressive piriformis stretching - it can aggravate nerve root tension.
For piriformis syndrome:
- Piriformis-specific stretches (pigeon pose, figure-four stretch).
- Glute strengthening - piriformis is often overactive because the bigger glute muscles (medius, maximus) are weak.
- Address triggers - cycling position, running cadence, prolonged sitting habits.
- Soft tissue work to the piriformis itself.
Mixing the two programmes is a common mistake.
Aggressive piriformis stretching for a disc-driven sciatica often makes the disc pain worse; McKenzie extensions for piriformis syndrome are usually neutral or mildly unhelpful.
When to image
Imaging (MRI) is justified for suspected sciatica if:
- Symptoms persist beyond 6 weeks despite good conservative care.
- Progressive neurological signs (worsening weakness, new numbness areas).
- Red flags (bladder/bowel changes, saddle numbness - these are emergencies).
For piriformis syndrome, imaging is usually unnecessary unless the diagnosis is uncertain or you're ruling out hip joint problems.
Typical Johor outcome
- Sciatica from disc: 60–85% of lumbar disc cases resolve conservatively within 12 weeks. The rest may need injection or surgery.
- Piriformis syndrome: 80–90% resolve within 6–10 weeks of targeted rehab.
Both have the same ultimate goal - return to full activity without fear of recurrence - but get there by different routes.
How PhysioJohor matches these patients
WhatsApp us with: pain location (focus on where it starts, not just where it travels to), triggers (sitting, coughing, running), any numbness or weakness, and any imaging you've had.
We match to a physio who will do the differential assessment in the first session - not just treat the symptom you named.
Related guide: Physiotherapy in Johor - complete guide