Sciatica vs. Piriformis Syndrome: How to Tell the Difference
Two causes of pain down the leg — one starts in the spine, one in the buttock
Updated July 20262 minute read
Sciatica usually starts in the lower back — most often a disc or nerve-root irritation — and runs down the leg, often worse with sitting, bending, or coughing. Piriformis syndrome starts in a deep buttock muscle that irritates the sciatic nerve, with pain centered in the buttock itself. Both usually respond well to physical therapy.
Aren't they the same thing?
Close cousins, not twins. "Sciatica" describes pain running down the path of the sciatic nerve — and in most people it starts in the lower back, where a disc or an irritated nerve root sets the whole leg complaining. Piriformis syndrome is different plumbing: the piriformis, a small muscle deep in the buttock, sits right on top of the sciatic nerve and can irritate it locally. Same nerve, different address — which is why the two get confused so often.
How to tell them apart
| Spine-driven sciatica | Piriformis syndrome | |
|---|---|---|
| Where it starts | Lower back or back of the hip | Deep in one buttock |
| Pain pattern | Back → buttock → down the leg, sometimes to the foot | Buttock ache, may radiate down the back of the thigh |
| What aggravates it | Sitting slumped, bending, lifting, coughing or sneezing | Sitting on hard surfaces, stairs, running, crossing the leg |
| Numbness/tingling | Common, can reach the calf or foot | Less common, usually stays higher |
| Tender to press? | Not especially — the back may ache, but pressing the buttock isn't the trigger | Yes — pressing deep in the buttock reproduces it |
| Typical exam clues | Straight-leg raise stretches the nerve and lights up leg pain | Stretching or contracting the piriformis (hip rotation) reproduces buttock pain |
If your pain clearly starts in the back and travels, start with the sciatica guide. If it lives in the buttock, read the piriformis syndrome guide. Pain that mostly announces itself as back pain radiating down the leg is more often spine-driven — a herniated disc is the classic culprit in adults under 60.
What you can try first
- Keep moving, gently. Bed rest makes both worse. Short, frequent walks are the safest starting dose.
- Change positions often. For spine-driven pain, break up sitting every 30 minutes. For buttock pain, add a cushion and stop sitting on your wallet.
- Easy nerve-calming movement: gentle back extensions or knee-to-chest stretches — whichever direction eases the leg symptoms is your friend.
When it's time to see someone
The good news: both conditions usually improve with physical therapy — targeted strengthening, nerve mobility work, and load management — without injections or surgery. Two to three weeks of self-care without progress is a sensible threshold for an evaluation.
Go sooner — to a physician, not a PT — for the real red flags: new numbness in the groin or genitals, loss of bowel or bladder control, or a leg that's getting weaker. Those need urgent medical assessment. For everything else, do I need PT for back pain? walks you through the decision.
Frequently asked questions
Sources (3)
This article is for education only and isn't medical advice. Always talk to a licensed clinician about your specific situation.