Piriformis syndrome is a condition in which the piriformis, a small, pear-shaped muscle deep in the buttock, irritates or squeezes the sciatic nerve. It causes a sciatica-like pain in the buttock that can travel down the back of the thigh. For most people, the first and most effective treatment is a consistent daily program of stretching and strengthening, and most people are symptom-free within 1 to 3 weeks of starting one. One surprising fact: only about 6% of sciatica cases actually come from this muscle.
Where Are the Piriformis Muscle and the Sciatic Nerve?
The name comes from the Latin pirum (pear) and forma (shape). The piriformis muscle is a flat, band-like muscle that runs from your sacrum, the triangular bone at the base of the spine, to the top of your thigh bone (femur). It plays a part in almost every lower-body movement, from walking to shifting your weight from one foot to the other. It has two jobs. When your hip is straight, it rotates your thigh outward. When your hip is bent, it pulls your thigh inward. Because it does both jobs all day long, it can easily get overworked.
The sciatic nerve is the longest and thickest nerve in the human body. It starts at the spinal cord, passes through the buttock, and runs down the back of each leg to the feet. In the leg it divides into two branches: the tibial nerve and the common peroneal nerve.
The way the nerve and muscle sit next to each other differs from person to person. In 1937, the anatomists Beaton and Anson described six variations, and doctors still use their system today:
| Variation | What happens | Why it matters |
|---|---|---|
| Type A (about 90% of people) | The sciatic nerve runs in one piece beneath the piriformis | Considered the typical anatomy |
| Type B | The common peroneal branch passes through the muscle and the tibial branch runs below it | The most common variation, and the one most often linked to piriformis syndrome |
| Types C–F | Other arrangements, including a nerve that passes through or above the muscle | Variations like these can make the syndrome more likely |
Estimates suggest that somewhere between just over 10% and up to 22% of people have one of these variations.
Piriformis Syndrome Symptoms: What It Feels Like
The main symptom is pain deep in the buttock, which can spread down the back of the thigh. People describe it in several ways:
- Dull, burning, or shooting pain
- Tingling or numbness
- Pain that grows the longer you sit
- Pain that gets worse with walking, running, or climbing stairs
- Symptoms usually on one side, though both sides can be affected
In severe cases, everyday tasks such as driving, working at a computer, or doing housework can become unbearable.
What Causes Piriformis Syndrome?
Doctors divide the causes into two groups.
Primary piriformis syndrome
This type comes from anatomy you were born with: a sciatic nerve that takes an unusual path, or a piriformis muscle with an unusual shape.
Secondary piriformis syndrome
This type has an outside trigger:
- Overuse: excessive running training, for example.
- Prolonged sitting: office workers, taxi drivers, and cyclists are at higher risk.
- Sudden injury: a fall, a sharp twist of the hip, or a direct blow during sports.
- An enlarged muscle: intense strength training or preseason conditioning can make the piriformis grow until it compresses the nerve.
- A thick wallet: sitting on a bulky wallet in a back pocket puts steady pressure on the muscle. It even has a name, “fat wallet syndrome.”
Rare causes include a piriformis muscle split into two parts, tumors, an aneurysm of the inferior gluteal artery, and bleeding near the muscle. The syndrome is also more common in women than in men.
How Piriformis Syndrome Is Diagnosed and Told Apart From Sciatica
No single test proves piriformis syndrome. Doctors diagnose it by ruling out other problems first. This matters because the symptoms overlap with several other conditions: a pinched nerve root in the lower back, sacroiliac joint problems, gluteal tendon problems, and hamstring injuries. The syndrome accounts for only about 0.3% to 6% of lower back pain cases. Because the symptoms overlap so much, it is both overdiagnosed and underdiagnosed.
Physical exam tests
Your clinician may move your leg into positions that stretch or tense the piriformis to see if they bring on your usual pain:
| Test | What happens |
|---|---|
| FAIR test (flexion, adduction, internal rotation) | You lie on your back. Your hip is bent, your leg is moved across your body, and your lower leg is rotated inward. |
| Freiberg test | Your straightened leg is firmly rotated inward. |
| Pace test | You push your legs outward and rotate them outward against resistance. |
| Beatty test | You lie on your side and lift your bent knee. Deep buttock pain is a positive result. |
Imaging and other tests
An MRI, CT scan, or ultrasound is mainly used to rule out other causes, such as a herniated disc, spinal stenosis, fractures, or tumors. A special MRI technique called MR neurography can show irritation of the sciatic nerve right below the piriformis. An EMG (a nerve and muscle test) can help rule out other nerve problems. Certain results on it, called H-waves, can point to compression by the piriformis.
A diagnostic injection serves as both a test and a treatment. A numbing medicine and a corticosteroid are injected into the piriformis muscle using ultrasound guidance. If your pain goes away, the muscle is very likely the source. A modified FAIR test combined with this injection is considered the most reliable way to make a clinical diagnosis. Some researchers now prefer the broader term “deep gluteal syndrome,” because other nearby muscles can also trap the sciatic nerve.
Physical Therapy Treatment for Piriformis Syndrome
The goal of physical therapy is to loosen the piriformis so it stops irritating the sciatic nerve, and to strengthen the hip muscles around it. The table below shows a typical starting program. Ask your physical therapist to adjust it to your needs.
| Exercise | How to do it | Dose |
|---|---|---|
| Knee-to-opposite-shoulder stretch | Lie on your back, bend one leg, and use the opposite hand to pull that knee toward your opposite shoulder. | Hold 30 seconds, 3 times per side, twice a day |
| Figure-4 stretch | Lie on your back and rest the ankle of your painful leg on the opposite knee. Pull the supporting knee toward your chest. You can also do this seated at a desk. | Hold 30 seconds, 3 times per side, twice a day |
| Bridge | Lie on your back with knees bent. Lift your hips and squeeze your glutes at the top. | 3 sets of 10, once or twice a day |
| Side leg lift | Lie on your side and lift your top leg, keeping it straight. | 3 sets of 10 per side |
| Clamshell | Lie on your side with knees bent in an L shape and heels together. Open your top knee like a clamshell. Add a resistance band to make it harder. | 3 sets of 10 per side |
Hands-on care and pain relief
- Manual therapy: deep tissue massage and myofascial release by a therapist can help relax the muscle.
- Self-massage: a foam roller or tennis ball can release trigger points. It works best after a therapist shows you how.
- Ice and heat: use an ice pack for 15–20 minutes, then later a heating pad on low for 15–20 minutes, switching every few hours.
- Iontophoresis: a mild electrical current, sometimes used to help muscles relax.
- TENS: weak electrical pulses through the skin that interfere with pain signals traveling to the brain.
What to expect
Most people are symptom-free within 1 to 3 weeks of starting their exercises. Others need several weeks of therapy before they notice a clear change, so it pays to be patient and stick with it. In one published case, a patient’s pain dropped from 5 to 1 on a numeric pain scale after four weeks of physical therapy combined with a corticosteroid injection. Relapses are common when people stop doing their exercises.
Walking, Exercise, and Movements to Avoid
Walking is generally fine and is actually recommended. It is a gentle aerobic exercise that keeps the muscle loose and helps prevent spasms. Walking and the elliptical trainer are the best cardio choices. Jogging is fine as long as it doesn’t cause pain. If walking makes your symptoms worse, let your physical therapist know.
| Better choices | Limit or avoid |
|---|---|
| Walking on flat ground | Sitting for more than 30 minutes without a break |
| Elliptical trainer | Cycling on a bike saddle, especially leaning forward |
| Water aerobics | Running or training on hills or uneven ground |
| Stationary bike, sitting upright | Jumping and other high-impact exercises |
| Yoga and Pilates | Sudden jumps in training intensity |
How to prevent piriformis flare-ups
- Warm up and stretch for 5–10 minutes before exercise.
- Keep good form when running and walking: stand tall and avoid letting your feet roll inward too much (overpronation).
- Get up and walk around for a few minutes every hour you sit, and every 30 minutes when symptoms are active.
- Increase training intensity gradually.
- Try a standing desk to reduce pressure on the muscle during work.
- Take your wallet out of your back pocket before you sit.
- Keep doing your home exercises after the pain is gone, especially if you have a known nerve variation or a history of flare-ups.
When Exercises Aren’t Enough: Medications, Injections, and Surgery
If physical therapy alone doesn’t control your pain, your doctor may add other treatments:
- Anti-inflammatory medicines such as ibuprofen, naproxen, or aspirin for short-term relief. Ask your doctor before taking them regularly.
- Prescription muscle relaxants such as baclofen or cyclobenzaprine to reduce muscle tension and pain signals.
- Corticosteroid injections, with or without a numbing medicine, to calm inflammation. Relief can last weeks, months, or even years. Plan to rest for 48 hours afterward and avoid heavy exertion and sports.
- Botulinum toxin (Botox) injections to relax the muscle and ease pressure on the nerve for several weeks to months. You need another injection once the effect wears off.
- Surgery, such as releasing the piriformis tendon or freeing the nerve, as a last resort. Results are not always predictable, and some patients still have pain afterward.
Relapses are rare after a successful injection followed by rehab.
Common Myths About Piriformis Syndrome
- Myth: Sciatica always means piriformis syndrome. Only about 6% of sciatica cases come from it. Problems in the spine, such as a herniated disc, need to be ruled out first.
- Myth: An MRI will show it clearly. Standard imaging mostly rules out other causes. Diagnosis relies on exam tests and often a diagnostic injection.
- Myth: Rest until it stops hurting. Long periods of sitting make it worse. Gentle walking and daily stretching are the main treatment.
- Myth: Only athletes get it. Office workers, drivers, and people who sit on a thick wallet are at risk too, and women get it more often than men.
- Myth: Surgery is the real fix. Most people get better with exercise, and surgery is a last resort with uncertain results.
When to See a Doctor
This article explains the condition in general terms and is not a diagnosis. Get medical care right away if you have:
- Sudden, severe pain in your lower back or leg along with muscle weakness or numbness
- Loss of bladder or bowel control. This is a medical emergency and needs treatment right away to prevent permanent damage.
- Frequent tripping or falling because of pain or numbness
Make an appointment if your symptoms last more than a week despite home care, or if a month of consistent stretching and exercise hasn’t helped. Piriformis syndrome can look like a herniated disc, a hamstring injury, or a gluteal tendon problem, and those need different treatment.
Frequently Asked Questions
How do I get rid of piriformis syndrome?
Start with a daily stretching and strengthening program, such as the figure-4 stretch, bridges, and clamshells. Take a short walking break at least every 30 minutes you sit, and use ice and heat for pain. If you aren’t better after about a month, see your doctor.
How long does piriformis syndrome last?
Most people are symptom-free within 1 to 3 weeks of starting an exercise program. Some need several weeks of physical therapy. Keep doing your exercises afterward, because relapses are common when people stop.
What exercises should I avoid if I have piriformis syndrome?
Avoid jumping and other high-impact moves, running on hills or uneven ground, and cycling on a saddle, especially leaning forward. Long stretches of sitting also aggravate the muscle.
How can I tell piriformis syndrome from sciatica?
You can’t reliably tell them apart on your own. Both can cause pain in the buttock and down the back of the leg. A clinician uses exam tests such as the FAIR test, imaging to rule out spine problems, and sometimes a diagnostic injection to find the source.
