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Piriformis syndrome: the runner’s guide to that deep glute pain

You’re a few kilometres into a run and there it is — a deep, aching pain in one buttock, sometimes shooting down the back of your leg. You’ve stretched it, foam-rolled it, ignored it, and it keeps coming back. If that sounds familiar, piriformis syndrome might be the culprit.

It’s one of those injuries that’s genuinely frustrating because it mimics sciatica, it doesn’t show up on basic scans, and the advice you find online ranges from “stretch constantly” to “never stretch it”. This guide cuts through that noise. You’ll find out what’s actually happening, what makes it worse, and what a sensible rehab and return-to-running plan looks like — whether you’re training for a parkrun or building toward a marathon.

One caveat before we start: deep gluteal pain can come from several sources, and self-diagnosis has limits. If your pain is severe, accompanied by numbness or tingling below the knee, or hasn’t shifted after 4–6 weeks of sensible management, see a physiotherapist or sports medicine doctor. That’s not a cop-out — it’s just true.

What is piriformis syndrome, and why does it affect runners?

The piriformis is a small, deep muscle that sits underneath your glute max. It runs from the front of your sacrum (the triangular bone at the base of your spine) to the top of your femur, and its main job is to externally rotate your hip and help stabilise your pelvis when you run.

The sciatic nerve either passes under the piriformis or, in about 15–20% of people, directly through it. When the piriformis becomes tight, inflamed or goes into spasm, it can compress or irritate the sciatic nerve — causing that distinctive deep buttock ache, sometimes with referral down the leg.

Runners are particularly vulnerable for a few reasons:

• Repetitive hip rotation during the gait cycle can overload the muscle, especially if your glutes aren’t doing their fair share of the work
• Sitting for long periods between runs (hello, desk job) keeps the muscle shortened
• Uphill running and trail running increase demand on external hip rotators
• Sudden mileage increases — the classic injury trigger that applies to almost everything

The important thing to understand is that piriformis syndrome isn’t usually a structural problem. In most cases, it’s a load management and muscle function issue — which is actually good news, because it’s largely fixable.

How to tell if it’s piriformis syndrome (and not something else)

The pain pattern is the first clue. Piriformis syndrome typically produces:

• Deep ache in one buttock (occasionally both)
• Pain that’s worse after sitting for 20+ minutes
• Discomfort going up stairs or hills
• Pain that eases a bit once you’re warmed up, then returns
• Referral down the back of the thigh — rarely below the knee

It can feel similar to true sciatica (nerve root compression from a disc problem), but there are differences. Sciatica usually involves pain below the knee, often with pins and needles or numbness, and frequently includes lower back pain. Piriformis syndrome tends to stay higher — buttock and upper hamstring — and the back is usually fine.

A simple self-test: the FAIR test (Flexion, Adduction, Internal Rotation). Lie on your back, cross the affected leg over the other (like a figure-4), and gently push the knee toward the floor. If this reproduces your deep buttock pain within 30–60 seconds, piriformis involvement is likely. This isn’t a definitive diagnosis — but it’s a useful pointer.

Research published in the Journal of Orthopaedic & Sports Physical Therapy consistently highlights that deep gluteal syndrome (the broader category piriformis syndrome falls under) is under-diagnosed and frequently confused with lumbar nerve root problems — which is exactly why getting a proper assessment matters if symptoms are stubborn.

The four phases of managing piriformis syndrome

Most runners want to know: can I keep running? The honest answer is: maybe, but probably less and differently than you want to.

Here’s a rough framework based on how acute your symptoms are:

These timelines are approximate. Some runners clear this in three weeks; others need three months. How long you’ve had it, how much you’ve tried to run through it, and how well your glutes function to begin with all play a role.

Stretches that actually help (and how to do them)

There’s a lot of conflicting advice about stretching for piriformis syndrome. Here’s the nuanced truth: aggressive, frequent stretching of an already irritated muscle can make things worse in the acute phase. In the sub-acute and rehab phases, mobility work genuinely helps.

Figure-4 stretch (supine)
Lie on your back. Cross the affected leg over the other in a figure-4, flex the bottom knee to 90°, and gently draw both legs toward your chest. Hold for 30–45 seconds. You should feel a deep pull in the glute — not shooting pain. 3 sets, twice daily.

Pigeon pose (gentle version)
On all fours, bring the affected knee forward toward your same-side wrist and lower your body down. Keep your hips level. Hold for 45–60 seconds. Avoid this if it provokes nerve symptoms.

Seated piriformis stretch
Sitting in a chair, cross the affected ankle over the opposite knee. Sit tall and hinge gently forward from the hips. You’ll feel it quickly. Hold 30 seconds, repeat 3 times.

What to avoid in the acute phase: deep end-range stretches, foam rolling directly on the piriformis (the pressure can further irritate the nerve), and anything that makes the referral pain shoot further down the leg.

Strengthening: the part most runners skip

Stretching alone won’t fix this. The reason most runners develop piriformis syndrome is that the piriformis is overworking to compensate for weak or inhibited glutes — particularly gluteus medius. Once you’re past the acute phase, strengthening is non-negotiable.

Exercises to include (3–4 times per week):

• Clamshells — 3 × 15 reps each side. Basic but effective. Add a resistance band once bodyweight feels easy.
• Single-leg glute bridges — 3 × 10 reps. Focus on level hips throughout.
• Side-lying hip abduction — 3 × 15 slow reps. Controlled movement, no swinging.
• Step-ups — 3 × 10 each leg on a 20–30cm step. Builds single-leg hip stability in a running-relevant position.
• Bulgarian split squat — once you’re 4–5 weeks in and pain-free during basic exercises. 3 × 8 each side.

The goal isn’t just to strengthen the piriformis but to get your entire posterior chain — glutes, hamstrings — functioning well enough that the piriformis doesn’t have to carry the whole load.

If you’re currently in a structured training plan and this injury hits mid-cycle, you’ll likely need to pause speedwork and long runs temporarily. Prioritise rehab over hitting weekly targets. Staying injury-free is the one thing that actually protects your marathon training — losing two weeks now is far better than losing eight later.

How to modify your running while you recover

If your symptoms allow any running at all, these modifications reduce stress on the piriformis:

• Stick to flat routes — hills increase hip external rotation demand significantly
• Shorten your stride slightly — overstriding increases hip rotation and glute loading on each foot strike
• Increase cadence by 5–10% — a higher cadence naturally reduces stride length and ground contact time. If you currently run at 160 steps per minute, aiming for 168–170 can help. Our guide to improving running cadence walks you through practical drills
• Run on softer surfaces where possible — grass or trail reduces impact load
• Limit run duration to 30–40 minutes until you’ve been symptom-free for a week

Post-run, apply ice to the deep gluteal area for 10–15 minutes if it’s inflamed. Anti-inflammatories (ibuprofen) can help short-term in the acute phase — check with a pharmacist or GP, especially if you have any contraindications. The NHS guidance on soft tissue injuries is a sensible reference point for managing the early days.

When to see a professional

Most cases of piriformis syndrome respond to the approach above within 6–8 weeks. But see a physiotherapist or sports medicine doctor if:

• Pain shoots below the knee or is accompanied by tingling/numbness
• One foot feels noticeably weaker than the other
• Symptoms haven’t improved at all after 4 weeks of consistent management
• You have a race in the next 4–6 weeks and symptoms are getting worse, not better

A good physio can assess your hip mobility, glute activation, and running gait in a way this article can’t. They might also use dry needling or manual therapy on the piriformis, which can accelerate recovery in stubborn cases. It’s worth the session fee.

The honest takeaway

• Piriformis syndrome is mostly a load and function problem, not a structural one. That means it responds well to sensible rehab — but only if you actually do the work.
• Don’t try to stretch your way out of it. Strengthening your glutes is the part that makes a lasting difference. Add clamshells and single-leg work 3–4 times per week from week 2 onward.
• Running through it aggressively makes it worse. Drop your volume by 50–70% in the first two weeks, modify your route (flat only), and gradually rebuild. Ten weeks of managed training beats two weeks off followed by eight weeks injured.
• Check your sitting habits. If you’re desk-bound for 8 hours a day, the piriformis is being compressed for most of your waking life. Stand up every 45–60 minutes, do a simple figure-4 stretch at your desk, and avoid sitting with your legs crossed.
• If symptoms include nerve referral below the knee or don’t improve in 4–6 weeks, see a physio. This guide gives you a framework, but a hands-on assessment is irreplaceable for persistent cases.

Next read: Hip flexor pain when running: causes and treatment