"I have sciatica" has become the default explanation for almost any pain that travels from the low back or buttock into the leg. And sometimes it's accurate. But sciatica — true radiculopathy from lumbar nerve root compression — is one of at least two common conditions that produce this pain pattern, and the other one, piriformis syndrome, is frequently misidentified, mistreated, and the source of significant unnecessary frustration for patients who wonder why their "sciatica" isn't getting better.

The distinction matters not because the names matter, but because the treatment that helps true sciatica can aggravate piriformis syndrome — and vice versa. Getting the diagnosis right is not academic. It changes what you do and how quickly you recover.

What True Sciatica Actually Is

True sciatica is radiculopathy — irritation or compression of a nerve root at the lumbar spine, where the sciatic nerve originates. The most common cause is a disc herniation at L4-L5 or L5-S1 that presses against the nerve root as it exits the spinal canal. Less commonly, it's caused by stenosis (narrowing of the spinal canal), spondylolisthesis (one vertebra slipping over another), or severe foraminal narrowing from degenerative change.

The characteristic presentation of true sciatica includes:

Pain that originates in the low back or buttock and travels in a defined pathway down the leg — typically following the back of the thigh, the outside of the lower leg, and into the foot
Numbness, tingling, or burning sensation in specific dermatomal patterns (specific areas of the leg and foot that correspond to specific nerve roots)
Symptoms that worsen with sitting, forward bending, coughing, or sneezing — activities that increase pressure on the disc and nerve root
Possible weakness in the leg or foot depending on which nerve root is involved
MRI findings showing disc herniation or foraminal narrowing at the corresponding level

What Piriformis Syndrome Actually Is

The piriformis is a small, deep muscle that runs from the sacrum to the greater trochanter of the femur — essentially crossing through the middle of the buttock. The sciatic nerve runs directly beneath the piriformis (and in some people, partially through it). When the piriformis becomes tight, hypertonic, or inflamed — from overuse, prolonged sitting, hip dysfunction, trauma, or chronic stress-driven muscle guarding — it compresses the sciatic nerve not at the spine but in the buttock itself.

The resulting pain travels down the leg in a pattern that can be nearly identical to true sciatica — making it easy to confuse and easy to misdiagnose, particularly when imaging is used to confirm the sciatica diagnosis. Piriformis syndrome will not show up on an MRI of the lumbar spine, because the compression is not at the lumbar spine.

The characteristic presentation of piriformis syndrome includes:

Pain that is centered more in the buttock than the low back — the deep aching or burning sensation is typically more lateral and deeper than typical lumbar sciatica
Significant tenderness to pressure directly over the piriformis muscle — pressing into the mid-buttock reproduces the symptoms
Pain that is worsened by prolonged sitting, particularly on hard surfaces, and by hip rotation
Symptoms that are often aggravated by the piriformis stretch (the figure-four stretch) because the stretch compresses the muscle against the sciatic nerve rather than releasing it
No significant low back component — the lumbar spine examination is often unremarkable
Normal lumbar MRI findings with no disc pathology at the corresponding level

Why Treatment Differs

For true sciatica: The primary goal is reducing nerve root irritation at the source — the lumbar spine. Gentle chiropractic adjustments to the lumbar spine and sacroiliac joint reduce the compression on the nerve root. Traction-based approaches, specific directional exercises, and avoiding the positions that increase disc pressure (forward flexion, prolonged sitting) are all relevant. Aggressive stretching of the piriformis during acute true sciatica can actually worsen symptoms by placing additional tension on an already-irritated nerve root.

For piriformis syndrome: The primary goal is releasing the piriformis muscle itself and addressing the hip mechanics driving its tension. Direct soft tissue work to the piriformis, chiropractic treatment focused on the sacroiliac joint and hip function, and careful progressive stretching of the piriformis are the core of effective treatment. Lumbar-focused treatment alone — adjusting the lumbar spine without addressing the hip and piriformis — will produce incomplete results because the source of compression is not in the lumbar spine.

The exercises that help piriformis syndrome are some of the same exercises that can aggravate true sciatica. Treating the wrong condition with the right treatment for the other condition is worse than doing nothing — because it keeps the actual problem unaddressed while potentially aggravating it.

The Third Option: Hip Flexor Strain and Referred Pain

Worth mentioning because it's frequently overlooked: tight hip flexors — particularly the psoas — can produce pain that refers into the anterior hip, groin, and anterior thigh that is sometimes interpreted as sciatica when it isn't. Psoas-related pain doesn't typically travel down the back of the leg the way sciatica does, but in patients with complex presentations, it can contribute to a confusing picture. Assessment of the hip flexors is a standard part of any thorough low back and leg pain evaluation.

How We Tell Them Apart at Breathe

A thorough clinical assessment for radiating leg pain includes orthopedic testing specifically designed to differentiate lumbar radiculopathy from piriformis syndrome — the straight leg raise, the FAIR test, direct palpation of the piriformis, and assessment of hip mechanics. In most cases, a clinical examination provides enough information to determine the likely source without imaging. When the clinical picture is unclear or when significant neurological compromise is present, we'll recommend appropriate imaging.

Getting the right diagnosis at the beginning is the most efficient path to recovery — it determines the entire treatment plan that follows.

If you have radiating leg pain that's been diagnosed as sciatica but hasn't responded to treatment, it's worth revisiting whether the diagnosis is accurate. Book a first visit at Breathe Chiropractic in Phoenix and let's find out what's actually driving it.

Dr. Carla Freeman, DC | Breathe Chiropractic | Phoenix AZ | (602) 254-2454