Reviewed by Matt Stanlake — Head Physiotherapist & Director, Upwell Health Collective. APA Member. AHPRA Registration: PHY0000975408. 20 years clinical experience. Last reviewed: May 2026.
The short answer: Sciatica and piriformis syndrome both cause buttock and leg pain, but they are distinct conditions. Sciatica is caused by compression or irritation of the sciatic nerve at the spinal level, most often from a lumbar disc bulge. Piriformis syndrome is caused by the piriformis muscle in the buttock compressing the sciatic nerve as it passes underneath. Sciatica typically causes pain into the calf or foot. Piriformis syndrome typically causes pain in the buttock that may radiate to the back of the thigh but rarely below the knee.
Sciatica is not a diagnosis on its own — it's a description of symptoms caused by irritation of the sciatic nerve at its spinal nerve roots. The most common cause is a lumbar disc bulge or herniation pressing on the L4, L5, or S1 nerve root. Other causes include spinal stenosis (narrowing of the spinal canal), spondylolisthesis (one vertebra slipping forward on another), or facet joint arthritis.
The symptoms include sharp, shooting, or burning pain that travels from the lower back or buttock down the leg, often past the knee into the calf, foot, or toes. There may be numbness, tingling, or weakness in specific muscle groups depending on which nerve root is affected. Coughing, sneezing, or bearing down typically worsens the pain because it increases pressure on the disc.
The piriformis is a small, deep muscle in the buttock that runs from the sacrum to the top of the femur. The sciatic nerve passes directly underneath (or in some people, directly through) this muscle. When the piriformis becomes tight, inflamed, or overactive, it can compress the sciatic nerve, producing buttock and leg pain.
Piriformis syndrome accounts for an estimated 6 to 8% of cases initially presenting as sciatica. The pain typically centres deep in the buttock, often felt as a tight knot or pinching sensation. It can radiate down the back of the thigh but rarely extends past the knee. Sitting on hard surfaces, prolonged driving, climbing stairs, and certain hip-rotation positions tend to make it worse.
The location of the pain is the strongest single clue. Pain that travels past the knee into the calf or foot is much more likely to be true sciatica. Pain that stays in the buttock or upper thigh is more likely piriformis-related.
The provocation tests differ. Sciatica worsens with a straight-leg-raise test (lying on your back and slowly lifting one straight leg up to 60-70 degrees). Piriformis syndrome typically does not reproduce pain with this test, but worsens with the FAIR test (hip flexion, adduction, internal rotation) or with prolonged sitting on the affected side.
Imaging tells a definitive story when needed. An MRI showing a disc bulge contacting a nerve root confirms sciatica. MRI in piriformis syndrome is typically unremarkable for the spine and may show changes in the piriformis muscle itself.
"The most common mistake I see is patients self-diagnosing piriformis syndrome because they read it on the internet, when they actually have classic L5 sciatica from a disc bulge. The treatments overlap somewhat in the early stages, but the long-term plans are different. A proper physiotherapy assessment can distinguish them in 15 minutes with the right tests." — Matt Stanlake, Head Physiotherapist, Upwell Health Collective
Sciatica from a disc bulge typically responds to a staged approach: pain relief in the first 1 to 2 weeks (relative rest, anti-inflammatories if appropriate, gentle movement), nerve mobility exercises and McKenzie-style directional preference work in weeks 2 to 6, and progressive strengthening and return to function from week 6 onwards. Around 70 to 90% of disc-related sciatica resolves without surgery within 12 weeks.
Piriformis syndrome typically responds to a different approach: targeted soft tissue release of the piriformis, gluteal and hip rotator strengthening, sitting modifications (avoiding wallets in back pockets, sitting timer breaks), and hip mobility work. Most cases resolve within 6 to 8 weeks with appropriate physiotherapy.
See a physiotherapist within the first 1 to 2 weeks of leg pain that travels from the back or buttock down the leg. Early diagnosis and appropriate intervention significantly improve outcomes for both conditions.
See a GP or attend an emergency department immediately if you have: progressive weakness in a leg, loss of bladder or bowel control, saddle anaesthesia (numbness around the groin or inner thighs), or severe and worsening pain that is not relieved by any position. These are red flags for cauda equina syndrome and require urgent assessment.
Technically yes — piriformis syndrome causes sciatic nerve irritation and therefore produces sciatica-type symptoms. But the cause and treatment differ from disc-related sciatica, so they are typically treated as separate conditions clinically.
Often yes. Studies show 70 to 90% of acute sciatica from a disc bulge resolves without surgery within 12 weeks. Physiotherapy speeds recovery and reduces recurrence risk significantly compared to no treatment.
Targeted piriformis release combined with gluteal strengthening typically produces the fastest results. Most patients experience meaningful pain reduction within 2 to 3 sessions of appropriate physiotherapy treatment.
Yes, but stretching alone is rarely enough. Effective treatment combines piriformis stretching with strengthening of the surrounding gluteal muscles, soft tissue release, and modification of aggravating activities. Stretching alone often produces only temporary relief.
Sitting doesn't cause either condition directly, but prolonged sitting worsens both. Sciatica from a disc bulge worsens because sitting increases disc pressure. Piriformis syndrome worsens because prolonged sitting tightens the piriformis muscle.
If you have buttock or leg pain and aren't sure whether it's sciatica or piriformis syndrome, a thorough physiotherapy assessment is the fastest way to get the right diagnosis and the right treatment plan. Upwell Health Collective in Camberwell offers 45 to 60 minute initial appointments. 28 free undercover carparks. All health funds accepted via HICAPS. Book online at upwellhealth.com.au or call (03) 8849 9096.
Matt Stanlake is the Head Physiotherapist and Director of Upwell Health Collective in Camberwell. He is a member of the Australian Physiotherapy Association (APAM) and AHPRA-registered (PHY0000975408) with 20 years of clinical experience. Matt has built Upwell into a 7x award-winning multidisciplinary allied health clinic trusted by AFL legends Mick Malthouse and Jonathan Brown. He is the author of Not Broken and the creator of the Whole Person Care framework.