Piriformis Syndrome
Sciatic nerve compression in the buttock caused by the piriformis muscle
Piriformis syndrome occurs when the piriformis muscle — a small muscle deep in the buttock that runs from the sacrum to the hip — becomes tight, inflamed, or spasms and compresses the sciatic nerve beneath or through it. This produces pain, tingling, and numbness in the buttock and down the back of the leg — symptoms nearly identical to disc-caused sciatica. Piriformis syndrome is estimated to account for 6–8% of all cases of sciatica.
Symptoms
- Deep, aching pain in the buttock, often one-sided
- Pain that radiates down the back of the thigh and calf (sciatica-like)
- Numbness or tingling in the leg
- Pain that worsens with sitting, especially on hard surfaces or after prolonged sitting
- Discomfort when climbing stairs or hills
- Tenderness when pressing directly on the piriformis muscle in the buttock
- Pain during hip movements, particularly internal rotation
Causes & Risk Factors
- Prolonged sitting, especially with legs crossed or on uneven surfaces
- Overuse from running or repetitive hip rotation activities
- Direct trauma to the buttock
- Anatomical variation — in about 15% of people, the sciatic nerve passes through the piriformis muscle rather than beneath it
- Leg length discrepancy causing altered hip and pelvic mechanics
- Weak hip abductors increasing load on the piriformis
- Post-hip surgery scarring near the piriformis
Treatment Options
Conservative (Non-Surgical)
- Piriformis stretching exercises (figure-four stretch, pigeon pose modifications)
- Physical therapy targeting hip rotator and gluteal muscle strength and flexibility
- Activity modification — avoiding prolonged sitting and aggravating movements
- Non-steroidal anti-inflammatory drugs (NSAIDs) for pain and inflammation
- Ice and heat therapy to relieve muscle spasm
- Piriformis muscle injection (corticosteroid or botulinum toxin) for pain relief and diagnosis
- Massage therapy and trigger point release of the piriformis
Surgical Options
- Endoscopic piriformis release — minimally invasive surgery to release the tight muscle and decompress the sciatic nerve (reserved for refractory cases that fail all conservative care)
When to see a spine specialist
See a physician if buttock and leg pain has not improved with stretching and anti-inflammatory treatment after 4–6 weeks, especially if symptoms are worsening. A spine or sports medicine specialist can differentiate piriformis syndrome from disc-related sciatica — proper diagnosis changes the treatment approach entirely.
Frequently Asked Questions
How is piriformis syndrome different from disc sciatica?
Both cause similar buttock and leg pain, but the source is different. Disc sciatica is caused by a herniated disc or bone spur in the lumbar spine compressing a nerve root. Piriformis syndrome is caused by the piriformis muscle in the buttock compressing the sciatic nerve after it exits the spine. Key differences: piriformis syndrome typically worsens with sitting and hip rotation, while disc sciatica often worsens with lumbar flexion, coughing, or sneezing. MRI of the lumbar spine is often normal in piriformis syndrome.
Can piriformis syndrome be diagnosed on MRI?
Standard lumbar MRI is usually normal in piriformis syndrome because the problem is in the buttock, not the spine. MRI of the hip and pelvis may show enlargement or signal changes in the piriformis muscle, but imaging findings are often subtle or absent. Diagnosis is primarily clinical — based on symptoms, physical examination, and a positive response to a diagnostic piriformis injection.
How long does piriformis syndrome take to heal?
With consistent stretching and physical therapy, many patients see significant improvement within 4–8 weeks. Chronic cases or those with underlying anatomical variation may take several months to fully resolve. Botulinum toxin (Botox) injections into the piriformis can provide relief lasting 3–6 months and may be repeated. Surgery is rarely needed but effective when the nerve is persistently compressed.
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Medical disclaimer: This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider for diagnosis and treatment decisions. Last reviewed March 2026. ICD-10: G57.00.