Sciatica vs Piriformis Syndrome: How to Tell the Difference

The short answer: You usually cannot tell at home. Sciatica comes from irritation of a nerve root in the spine, while piriformis syndrome is thought to come from a deep buttock muscle pressing on the sciatic nerve. Both cause buttock and leg pain. Piriformis syndrome is a contested diagnosis made after other causes are ruled out.

• Piriformis syndrome is described as a deep buttock muscle (the piriformis) compressing part of the sciatic nerve, causing buttock pain that can travel down the leg [1]. Sciatica is pain along the path of the sciatic nerve, most often thought to start in the spine.
• The clues that point to piriformis syndrome are buttock pain, pain worse when sitting, tenderness deep in the buttock, and pain with movements that stretch or squeeze the muscle [5].
• None of those clues is reliable on its own. Buttock pain is also very common in sciatica from a spinal nerve root [7].
• Piriformis syndrome is a contested diagnosis. Reviews call it a diagnosis of exclusion, with no validated gold-standard test [4][7].
• Both conditions are usually managed first with graded movement and physical therapy. OrthoInfo says 80% to 90% of people with sciatica improve without surgery [3].
• Numbness around the groin or bottom, new bladder or bowel changes, weakness in both legs, fever, or pain after an injury need urgent care [2][8][9].

Look at where the pain starts, what makes it worse, and whether you have nerve symptoms. But treat these as clues, not a diagnosis.

What this means: the two overlap. A provider's exam and, if needed, imaging are the way to sort them out. The "Sciatica" column is a plain-language summary of what the sources say about disc-related sciatica. The "variable" and "not typical" entries are not directly sourced.

Sciatica is pain along the sciatic nerve, which runs from the lower back through the buttock and down the back of the leg. See our glossary entry on the sciatic nerve and our sciatica page.

OrthoInfo says that about 80% to 90% of patients improve without surgery, often within several weeks when a herniated disc is the cause. Results are less certain with bone spurs or spinal stenosis [3]. The NHS says sciatica usually improves within a few weeks to a few months, but it can last longer and come back [2]. For more on timing, see our realistic sciatica timeline.

Piriformis syndrome is described as a condition in which the piriformis muscle presses on part of the sciatic nerve. Mayo Clinic's library describes it as uncommon, causing pain in the buttocks and sometimes down the leg. The piriformis runs from the base of the spine across the pelvis to the top of the thighbone [1].

Symptoms include ongoing aches, pain, tingling or loss of feeling in the buttocks. They can extend down the back of the thigh and calf, and sometimes to the foot. Running, or sitting on a toilet or bicycle seat, can bring them on [1].

A narrative review in the HSS Journal (2025) says the commonly affected age is the fourth or fifth decade, and women may be affected more often. It lists buttock pain worsened by sitting, rising from bed, or hip flexion and rotation [4]. A systematic review of its clinical features describes a set of four symptoms and signs: buttock pain, pain worsened by sitting, tenderness near the greater sciatic notch, and pain with movements that tighten the piriformis. Limited straight leg raising was also listed [5]. For more on this muscle, see our piriformis syndrome page.

It is contested, and you should hear that plainly.

• No gold standard. The HSS Journal review says there is no validated gold standard or single reliable test, and describes it as "typically a diagnosis of exclusion." The review cited an expert who recommends moving away from the umbrella term in favor of more anatomically specific descriptions [4].
• Tests are unproven. Many physical tests exist, such as the FAIR test, Freiberg sign and Pace sign, but their accuracy cannot yet be determined [4][5]. A diagnostic injection into the muscle is used by some clinicians, but it is not validated or standardized [4].
• Prevalence is uncertain. A figure of 5% to 8% of low back pain cases is often cited. Another estimate puts it at 0.3% to 0.6%, and the review does not reconcile them [4]. A neurology commentary compares the 6% to 8% figure with an estimated 0.5% to 1% in orthopedic practice, and advises "healthy skepticism" before making or accepting the diagnosis [6].
• Case reports dominate. WikiMSK notes that case series often treat good outcomes from treatment as proof of the diagnosis, and that the frequently cited 6% to 8% figure is not supported by prevalence data in the original article [7]. The HSS review says most of the studies it cited were small and observational [4].
• Anatomy may differ. Reviews note that other deep muscles, such as the obturator internus, can also press on the nerve, and that some people have a nerve that passes through the piriformis [4][6].

On the other side, the HSS Journal review argues piriformis syndrome is often overlooked as a cause of buttock pain and sciatica, and that diagnosis is often delayed because symptoms overlap with spine problems [4].

What this means: you may be told you have "piriformis syndrome" because other causes were ruled out, or because an exam found a tender spot. Either way, the label matters less than finding a plan that eases your pain and gets you moving. Keep an open mind if you are told it is sciatica from the spine, because buttock pain is very common in that condition too [7].

Several conditions cause buttock or leg pain. The HSS Journal review's list includes lumbar disc herniation and radiculopathy, facet arthritis and sacroiliitis [4]. See our pages on herniated disc, facet joint syndrome and SI joint dysfunction. WikiMSK adds that referred pain from the disc, facet or sacroiliac joint can also be mistaken for nerve compression [7].

The first steps are similar for both: stay active, and build up movement gradually.

• Sciatica. The NHS advises staying active and avoiding long periods of sitting or lying down. OrthoInfo says a doctor may recommend short walks and being as active as possible [2][3]. See our guide on walking with sciatica and sleeping with sciatica.
• Piriformis syndrome. Treatments described in reviews include piriformis stretching, physical therapy and pain medicines. Injections of local anesthetic, steroid or botulinum toxin, and surgery for stubborn cases, are also used [6]. The HSS review says conservative care, including physical therapy, is typically effective [4]. WikiMSK argues injections and surgery are done too often without adequate justification [7].

No trial we found compares treatments for piriformis syndrome head to head, and the evidence is weak. Start with the gentlest options, and ask a provider before considering injections or surgery.

Two gentle moves to try

These are common starting points, not from a trial. Go slowly, and skip any move that sends pain further down your leg.

1. Glute bridge. 

Lie on your back with your knees bent. Squeeze your buttocks and lift your hips until your body forms a line from shoulders to knees. Hold 2 seconds, then lower. Do 2 sets of 8 to 12. See our glute bridge.

1. Gentle figure-4 or pigeon-style stretch. 

Lie on your back with one ankle across the opposite knee, and gently pull the legs toward your chest until you feel a mild stretch in the buttock. Hold 20 to 30 seconds, 2 or 3 times each side. The floor pigeon pose is harder on knees and hips; start with the lying version. See our pigeon pose.

Stop if you feel sharp pain, leg pain that spreads further down, new numbness or weakness, or your symptoms are clearly worse the next day. Rest, and ask a provider or physical therapist if it keeps happening.

Kai, Loosn's AI physio coach, can help you pace gentle movement around your own symptoms. It does not replace an assessment if your symptoms are severe, getting worse or unusual.

Loosn is not a diagnosis tool. For more detail on warning signs, see when lower back pain is serious.

Emergency: call 911 (or your local emergency number) or go to the emergency department if [2][8][9]:

• you have numbness around or under your genitals, or around your bottom (saddle numbness)
• you have new bladder or bowel problems, such as trouble peeing, or losing control of peeing or pooing
• you have sciatica on both sides, or weakness, tingling or numbness in both legs
• your back or buttock pain comes with a fever
• your pain follows a fall, a blow to the back or another injury

Do not drive yourself [2][9]. (Other common emergency numbers are 999 in the UK, 112 across the EU and 000 in Australia.)

See a provider soon if [2][8][9]:

• leg weakness, numbness or tingling is getting worse (progressive)
• pain spreads down one or both legs, especially below the knee
• pain is severe and does not ease with rest
• you are losing weight without trying
• pain has not improved after a few weeks of home treatment, or is stopping you doing normal activities
• you want to discuss injections, imaging or physical therapy

Loosn is not a substitute for assessment when symptoms are severe, getting worse or unusual.

How do I know if it's sciatica or piriformis syndrome? 

You cannot tell reliably at home. Piriformis syndrome tends to cause buttock pain that is worse with sitting, with tenderness deep in the buttock [5]. Sciatica from a spinal nerve root can feel similar, and buttock pain is common in it too [7]. No test is validated for either, so a provider's exam, and sometimes imaging, is needed [4].

What does piriformis syndrome feel like? 

Typically an ache or pain deep in the buttock, sometimes with tingling, that can travel down the back of the thigh and calf and occasionally to the foot [1]. Sitting, running, or sitting on a toilet or bicycle seat can bring it on [1]. Weakness and numbness are described as unusual [6]. Many other conditions cause similar pain.

Is piriformis syndrome real? 

It is contested. Reviews call it a diagnosis of exclusion with no gold-standard test [4][7], and one neurology commentary advises healthy skepticism before accepting the diagnosis [6]. Others consider it an under-recognized cause of gluteal pain and sciatica [4]. Prevalence estimates range from under 1% to 8% of people with back or buttock pain [4][6].

Can piriformis syndrome cause sciatica? 

Possibly. Reviews describe piriformis irritation of the sciatic nerve causing sciatica-like pain, though how often this happens is unclear [4][5]. Mayo Clinic describes the piriformis muscle compressing part of the sciatic nerve [1]. Most sciatica is thought to start in the spine, so a provider usually rules out a spinal cause first [4][7].

Does stretching help piriformis syndrome? 

Piriformis stretching is among the treatments described, alongside physical therapy and injections [6]. But the evidence base is mostly case reports and small observational studies [4]. For sciatica in general, the NHS advises staying active, and OrthoInfo says 80% to 90% of patients improve without surgery [2][3]. Go gently and stop if leg pain worsens.

When is buttock and leg pain an emergency? 

Go to the emergency department or call 911 for numbness around the genitals or bottom, new bladder or bowel problems, weakness or numbness in both legs, fever with back pain, or pain after a fall or injury [2][8][9]. See a provider if pain worsens, spreads, brings weakness or numbness, or has not improved after a few weeks [2][8].

Loosn's app pairs a short movement profile and daily check-in with real-time form feedback, so you can pace gentle exercises around your pain. Download the app and meet Kai, Loosn's AI physio coach, or read how Loosn works.