Piriformis syndrome is not the same as sciatica, but it can feel nearly identical. Sciatica is a symptom, not a diagnosis. It describes pain that radiates along the sciatic nerve, typically from the lower back through the buttock and down the leg. Piriformis syndrome is one specific cause of that pain, where a small muscle deep in the buttock compresses the sciatic nerve. The far more common causes of sciatica are spinal problems like herniated discs and spinal stenosis.
Why the Confusion Exists
The sciatic nerve is the longest nerve in the body, running from the lower spine all the way down each leg. Anything that pinches or irritates it along that path can produce sciatica. In most cases, the compression happens at the spine, where a bulging disc or narrowed spinal canal presses on the nerve roots. In piriformis syndrome, the compression happens much lower, at the level of the buttock, where the sciatic nerve passes near or through the piriformis muscle.
Because the same nerve is involved in both situations, the resulting pain can feel remarkably similar: a shooting or burning sensation that travels from the buttock down the back of the leg. This overlap is why piriformis syndrome is sometimes called “wallet sciatica” or “pseudo-sciatica,” and why it’s frequently misdiagnosed or overlooked entirely.
Where the Pain Starts Matters
The biggest difference between spinal sciatica and piriformis syndrome is the origin of the compression. With a herniated disc, the problem begins in the lumbar spine. Pain often starts in the lower back and radiates downward. You may notice it worsens with bending forward, coughing, or sneezing, because those movements increase pressure on the disc.
Piriformis syndrome produces pain that’s centered in the buttock, without significant lower back involvement. It tends to flare during prolonged sitting, climbing stairs, or activities that involve hip rotation. The piriformis muscle sits deep behind the gluteal muscles and helps rotate the hip outward. When it becomes tight, inflamed, or spasms, it can squeeze the sciatic nerve right where it passes underneath (or in some people, through) the muscle. Pressing firmly on the deep buttock in the right spot often reproduces the pain, which is less common with spinal causes of sciatica.
How Common Is Piriformis Syndrome?
True piriformis-related sciatica is relatively rare. Estimates suggest it accounts for only 0.3% to 0.6% of cases involving lower back or posterior thigh pain. Broader estimates that include buttock pain put it at 5% to 8% of low back pain cases. Either way, the vast majority of sciatica traces back to the spine. That said, piriformis syndrome likely goes underdiagnosed because standard imaging of the lumbar spine won’t reveal it, and clinicians may stop looking once spinal imaging comes back normal.
Anatomy That Makes Some People Vulnerable
Not everyone’s sciatic nerve follows the same path past the piriformis muscle. In the most common arrangement, the undivided nerve passes below the undivided muscle. But anatomists have identified at least six variations. In some people, the nerve splits and one branch passes directly through the piriformis muscle. In others, a branch travels above the muscle while the rest passes below. These anatomical differences may explain why some people develop piriformis syndrome while others with equally tight piriformis muscles never do.
How Each Condition Is Identified
Spinal sciatica is typically confirmed with an MRI of the lumbar spine, which can show a herniated disc, bone spur, or narrowed spinal canal pressing on nerve roots. Piriformis syndrome is harder to pin down. There’s no single definitive test for it, and standard lumbar MRI won’t show anything wrong because the problem isn’t in the spine.
Clinicians rely heavily on physical examination. One commonly used maneuver is the FAIR test, which stands for flexion, adduction, and internal rotation. You lie on your back while the examiner bends your hip, moves your knee inward across your body, and rotates the hip. If this reproduces your sciatic pain, it suggests the piriformis is the culprit. The FAIR test has a reported sensitivity of 88% and specificity of 83%, making it a reasonably reliable screening tool.
Another test is the Freiberg sign, where you resist against the examiner rotating your hip inward while the hip is extended. This engages the piriformis and reproduces pain in roughly 63% of patients who have the condition. When spinal imaging is clean and these physical tests are positive, the picture points toward piriformis syndrome.
How Symptoms Feel Different Day to Day
People with piriformis syndrome often notice a very specific trigger pattern. Sitting on hard surfaces for more than 15 to 20 minutes becomes uncomfortable. Getting in and out of a car, crossing your legs, or walking upstairs can all set it off. The pain tends to be deep and aching in one buttock, sometimes with numbness or tingling running down the back of the leg on the same side.
Spinal sciatica can produce those same leg symptoms but often comes with noticeable lower back stiffness or pain. It may worsen with forward bending or lifting, and in more severe cases, you might notice weakness in the foot or difficulty lifting your toes. Piriformis syndrome rarely causes that kind of foot weakness because only the portion of the nerve beyond the buttock is affected, not the nerve roots at the spine.
Treatment Differences
Because the underlying cause differs, treatment approaches diverge. Spinal sciatica is managed based on whatever is compressing the nerve root: physical therapy focused on spinal mobility, anti-inflammatory medications, epidural steroid injections near the spine, or in persistent cases, surgery to relieve disc pressure.
Piriformis syndrome responds to a different strategy. Stretching the piriformis muscle is the first-line approach, and research shows that holding stretches for 30 seconds, repeated twice with a 30-second rest between, is more effective than shorter holds. Multiple stretching positions work equally well, so you can choose whichever is most comfortable. One popular version involves lying on your back, crossing the affected leg over the opposite knee, and pulling the bottom knee toward your chest. Another involves pressing the knee of the crossed leg toward the floor on the opposite side. Both target the piriformis effectively.
Beyond stretching, treatment may include massage or pressure release on the piriformis, strengthening the hip stabilizers, and modifying activities that provoke symptoms (sitting less, using a cushion, avoiding cross-legged positions). In cases that don’t respond to conservative care, a targeted injection into the piriformis muscle using ultrasound guidance can reduce inflammation and confirm the diagnosis at the same time. Surgery to release the piriformis muscle is reserved for the small number of cases that fail everything else.
Getting the Right Diagnosis
If you’ve been told you have sciatica but your MRI looks normal, piriformis syndrome is worth investigating. The condition is frequently overlooked because it doesn’t show up on the imaging tests most commonly ordered for sciatic pain. A physical examination that specifically tests the piriformis through hip rotation maneuvers is the most practical path to identifying it. Knowing whether your pain comes from the spine or from a muscle in the buttock changes the entire treatment plan, so the distinction is more than academic.