Piriformis syndrome: symptoms or pseudo-sciatica?

Where is the piriformis muscle?

The piriformis is a small, deep muscle located in the buttock.

It connects the sacrum area to the upper part of the femur and is involved in hip movements.

The sciatic nerve passes very close to this muscle. The anatomical relationships can vary from one person to another.

Tension or irritation in this area can therefore produce pain that resembles lumbar sciatica.

What are the symptoms of piriformis syndrome?

The most typical symptom is pain in the buttock.

It may remain localised or radiate down the back of the thigh, into the calf and sometimes as far as the foot.

Tingling or numbness may also appear.

According to the MSD Manual, the pain is often worse when the piriformis muscle is compressed against the nerve, for example during running or prolonged sitting in a car or on a bicycle saddle.

A person may therefore feel relatively well when standing and experience more discomfort after sitting for thirty minutes.

Piriformis syndrome or lumbar sciatica?

The distinction is not always clear without an examination.

Classic sciatica generally comes from irritation of a nerve root in the lower back. A herniated disc is one of the common causes.

The pain may then be associated with back pain and follow a characteristic path down the leg. Coughing or sneezing can also increase the pain.

In piriformis syndrome, the pain starts more in the buttock area, and certain positions that compress the buttock can trigger it.

These characteristics guide the diagnosis, but they cannot always settle it on their own.

Why can the piriformis become painful?

Running, activities involving many hip movements and long periods of sitting can irritate the area in some people.

A significant change in training volume can also bring on symptoms.

However, some buttock pain has a different origin: the hip joint, the lower back, the gluteal tendons or the sacroiliac joints.

This is one of the reasons why piriformis syndrome remains a clinical diagnosis that sometimes requires other causes to be ruled out.

How is the diagnosis made?

There is no single test that confirms every case of piriformis syndrome.

The healthcare professional analyses the path of the pain, the movements that trigger it, hip mobility and the neurological examination.

Further tests may be requested when a lumbar cause or another condition needs to be investigated.

The clinical examination therefore remains central.

How can piriformis syndrome be relieved?

The MSD Manual mainly mentions modifying activity and stretching among the first treatment measures.

If long periods of sitting trigger the pain, regularly breaking up this position can already reduce the irritation.

For runners, a temporary reduction in volume or intensity may be necessary.

Mobility and strengthening work is then adapted to the assessment. Aggressive stretching of a very painful area is not necessarily helpful.

Heat can provide comfort when muscle tightness accompanies the pain.

To learn more, see the Bluetens guide to electrostimulation for sciatica and the article on gluteal muscle tightness.

Should you keep moving with sciatic pain?

When the pain remains bearable, suitable activity is generally preferable to prolonged bed rest.

French national health insurance (Assurance Maladie) recommends continuing activities that are compatible with the pain and advises against prolonged bed rest for common sciatica.

However, the level of activity should be adjusted if certain movements significantly increase the symptoms.

When does sciatica-like pain become urgent?

Significant or progressive weakness in one leg requires a prompt assessment.

Also seek emergency care in case of loss of sensation in the perineum, new difficulty urinating, unusual urinary leakage or loss of bowel control. These symptoms may signal a serious neurological problem.

Does piriformis syndrome go away?

The outcome depends on the cause and how long the symptoms have been present.

When the irritation is linked to a sports load or a repeated position, changing this stress and suitable rehabilitation can gradually improve the symptoms.

Pain that persists or worsens warrants a new assessment to check that the origin has been correctly identified.

Medical sources

• MSD Manual: piriformis syndrome

• MSD Manual: sciatica and neurological signs