Piriformis Syndrome

Piriformis syndrome causes pain in the buttocks that can travel down the leg. It happens when a small muscle deep in your buttock presses on your sciatic nerve. While not very common, affecting only about 0.3% to 6% of people with lower back pain, it can significantly impact your daily activities.

Table of contents

• What is piriformis syndrome?
• What causes this condition?
• Symptoms and warning signs
• Who is most affected?
• How doctors diagnose piriformis syndrome
• Treatment options
• Prevention and outlook

What is piriformis syndrome?

Piriformis syndrome is a painful condition that develops when the piriformis muscle compresses or irritates the sciatic nerve (the longest, largest nerve in your body that runs from your lower spine down through your buttocks to your feet)^[1]. The piriformis is a flat, narrow muscle located deep in your buttock region. It runs from your lower spine through your butt to the top of your thighs and helps with hip rotation and almost every movement of your lower body^[1].

The sciatic nerve typically runs underneath the piriformis muscle, though in some people it may pass through or even above the muscle. This proximity is why problems can develop^[4]. When the piriformis muscle becomes irritated or inflamed, it affects the adjacent sciatic nerve, resulting in pain that feels similar to sciatica (nerve pain that radiates from the lower back or buttock down the leg)^[3].

• Piriformis muscle
• Sciatic nerve
• Buttocks
• Hip joint
• Lower spine
• Thigh

What causes this condition?

Piriformis syndrome occurs when something causes the piriformis muscle to press on the sciatic nerve. The most common causes include inflammation or swelling in the piriformis muscle or surrounding tissues, muscle spasms, and scarring in the muscle^[1].

Several factors can lead to these problems. Injury to the hip, buttock, or leg from a fall or car accident can damage the muscle^[1]. Poor body mechanics, whether from a chronic condition or acute injury involving forceful internal rotation of the hip, can stress the piriformis muscle^[3]. Lifting objects improperly or not warming up before physical activity and stretching properly afterward can also damage the muscle^[1].

Activities that put prolonged pressure on the muscle are significant risk factors. Sitting for long periods, especially common among taxi drivers, office workers, and bicycle riders, can trigger symptoms^[3]. Athletes may develop piriformis syndrome during periods of increased weightlifting or pre-season conditioning that cause muscle enlargement^[3]. Overexercising or performing repetitive motions like long-distance running can also lead to problems^[1].

In some cases, abnormal anatomy causes the condition. Healthcare providers call this primary piriformis syndrome. A person can be born with a sciatic nerve that takes an unusual path through the body, or with an abnormally formed piriformis muscle^[1]. In more than 80% of people, the sciatic nerve runs deep beneath the piriformis muscle, but variations in the nerve’s path or early divisions of the nerve can make some individuals more susceptible^[3].

Symptoms and warning signs

The hallmark symptom of piriformis syndrome is pain in the buttock region. People often describe deep, persistent aching, burning sensations, numbness, tingling, or shooting pain^[1][6]. While the pain may start in the buttock, it commonly radiates down the back of the thigh, calf, and sometimes into the foot, following the path of the sciatic nerve^[2][7].

Certain activities typically worsen the symptoms. Pain often increases during prolonged sitting, which is why many people have difficulty sitting comfortably or putting weight on the affected buttock^[2][7]. Climbing stairs, walking uphill, running, or squatting can intensify discomfort^[1][4]. The pain can become so severe that it affects your ability to perform normal activities like sitting on a toilet seat or cycling^[4].

Some people find relief when lying down on their back^[7]. The condition can affect one side of the body or both, though single-sided pain is more common^[1][2]. Additional symptoms may include tenderness in the buttock area, muscle tightness or stiffness around the affected muscle, weakness or numbness in the legs, and changes in posture or walking patterns^[6][13].

Who is most affected?

While piriformis syndrome is not very common, accounting for only about 0.3% to 6% of lower back pain cases, certain groups face higher risk^[1]. The condition appears to affect women more frequently than men, though the exact reason for this difference remains unclear^[2][13].

Athletes involved in specific sports are particularly vulnerable. Skiers, tennis players, long-distance runners, and cyclists commonly develop this condition due to the repetitive hip movements and extended periods of activity these sports require^[5]. Marathon runners and other endurance athletes may experience symptoms during intense training periods^[11].

People with sedentary lifestyles or occupations also face increased risk. Truck drivers and office workers who spend prolonged periods sitting are susceptible to developing piriformis syndrome^[5][3]. Carrying a thick wallet in a back pocket directly behind the piriformis muscle can contribute to the problem^[13].

Pregnant women may develop symptoms as their bodies adapt to accommodate the growing baby, with changes in pelvic alignment and increased pressure on surrounding muscles affecting the piriformis^[20].

How doctors diagnose piriformis syndrome

Diagnosing piriformis syndrome can be challenging because there is no specific blood test, biopsy, or imaging test that definitively confirms the condition^[13]. The diagnosis is primarily clinical, meaning it relies on your symptoms and physical examination rather than laboratory results^[3][13].

During your visit, a healthcare provider will ask detailed questions about your symptoms, activity habits, and medical history, including any injuries^[1]. The physical examination involves stretching, rotating, pressing, and moving your hip, buttock, and leg through various positions to identify what causes pain and what doesn’t^[1]. The doctor may perform specific maneuvers to see if they trigger characteristic pain in the buttock and leg^[5].

Because other conditions can cause similar symptoms, doctors often need to rule out alternative diagnoses. Conditions like herniated disc, spinal stenosis, hip bursitis, sacroiliac joint dysfunction, or pelvic problems can mimic piriformis syndrome^[3][13]. Imaging tests such as MRI (magnetic resonance imaging, which uses magnets and radio waves to create detailed pictures of your body’s soft tissues) or CT scans (computed tomography scans that create three-dimensional images) may be ordered to exclude other causes of sciatic nerve compression^[2][5]. Sometimes ultrasound imaging is used to visualize the muscle pressing on the nerve and confirm the diagnosis^[4].

Treatment options

Most cases of piriformis syndrome improve with rest and conservative treatment. The condition often goes away in a few days or weeks with simple interventions^[1]. If symptoms are brief and treatment begins soon after they appear, recovery is typically faster^[13].

Self-care and lifestyle changes

The first step involves avoiding activities that trigger pain, such as prolonged sitting, running, or biking^[2]. Taking breaks to stand up and move around every 30 minutes can help reduce pressure on the muscle^[4]. Using a standing desk may benefit those with desk jobs^[4].

Applying ice packs for 15 to 20 minutes every few hours, wrapped in a towel to protect your skin, can help reduce pain and inflammation^[2]. You can alternate cold packs with a heating pad on low setting, though heat applications should not exceed 20 minutes at a time^[2]. Maintaining proper posture when sitting, standing, or driving is also important^[2].

Medications

Over-the-counter pain relievers can provide relief. Options include ibuprofen (a nonsteroidal anti-inflammatory drug that reduces inflammation and pain), naproxen (another anti-inflammatory medication), or acetaminophen (a pain reliever that works differently from anti-inflammatory drugs)^[2][10]. Your healthcare provider may prescribe muscle relaxants to help relax the muscle so you can exercise and stretch it more effectively^[2]. In some cases, medications like gabapentin or pregabalin may be used to calm nerve pain^[10].

Physical therapy and exercises

Physical therapy is considered the mainstay of treatment for piriformis syndrome^[13]. Treatment focuses on carefully and progressively stretching the piriformis muscle^[7]. Your provider will instruct you on special stretches that can relax and strengthen the muscle^[2].

A common stretching technique involves lying on your back, bending one leg at the knee while keeping the other flat, raising the bent knee and moving it across your body toward the opposite shoulder, and holding the stretch for at least 15 to 30 seconds^[17]. These stretches should be performed several times each day and before participating in sports activities^[2].

Physical therapy may include additional treatments such as soft-tissue massage to decrease muscle tightness, manual therapy techniques, heat or ice applications, and strengthening exercises for hip muscles^[14][13]. Some therapists perform myofascial release techniques specifically for the piriformis muscle^[14].

Injection treatments

When oral medications and physical therapy don’t provide adequate relief, injection treatments may be recommended^[10]. A combination of local anesthetic and corticosteroid (a powerful anti-inflammatory medication) can be injected directly into the piriformis muscle to reduce inflammation and swelling^[2][7]. Studies show that approximately 73% of patients report moderate to high levels of pain relief after steroid injections, though about 50% experience symptom recurrence after five weeks^[10].

In some cases, botulinum toxin injections may be considered to help reduce muscle tightness^[2][7]. For more severe pain, doctors may recommend electrotherapy (treatment using electrical stimulation to reduce pain and stop muscle spasms), such as TENS (transcutaneous electrical nerve stimulation)^[2].

Surgery

Surgery is rarely needed and is only considered as a last resort when conservative treatments fail to provide relief^[2][5]. The surgical procedure involves releasing the piriformis muscle and decompressing the sciatic nerve^[5]. Surgery may be warranted when there is severe, progressive neurological deterioration, such as leg weakness^[10].

Prevention and outlook

The outlook for piriformis syndrome is generally positive. Most episodes resolve within a few days or weeks with rest and simple treatments^[1]. The duration varies, but when proper treatment begins soon after symptoms appear, recovery is often brief^[13].

While there is no completely reliable way to prevent piriformis syndrome, several strategies can reduce your risk^[13]. Getting regular exercise helps maintain muscle strength and flexibility^[2]. Always warm up and stretch before exercising, then gradually increase activity intensity^[2]. Avoid running or exercising on hills or uneven surfaces^[2].

Pay attention to your body’s signals. If something causes pain, stop doing it and rest until the pain passes^[2]. Avoid prolonged sitting, and don’t carry a wallet in your back pocket directly behind the piriformis muscle^[13]. If triggered by vigorous exercise, reducing intensity or changing activities, such as switching from running to swimming, can prevent future episodes^[13].

Maintaining proper posture when sitting, standing, or driving is important^[2]. If you have leg-length differences, using a heel-lift may help^[13]. Getting treatment for other contributing conditions, such as spinal arthritis or foot problems, can also reduce your risk^[13].

You should contact your doctor if pain does not improve within a week, if it gets worse, if you develop other symptoms like bowel or bladder problems or muscle weakness, if you have difficulty performing normal activities, or if pain develops after physical trauma or a fall^[4][17].