What Causes Sciatica? Phoenix Chiropractic Guide

What Causes Sciatica—and Why Treating Only the Pain May Not Be Enough

What causes sciatica can be confusing because where you feel it usually isn’t where it starts.

A burning calf. A tingling foot. A deep ache in the buttock. A sharp pain that shoots from the low back down the leg. It’s natural to want to treat whatever spot hurts most — but with sciatica, that’s often only part of the story.

Sciatica happens when the sciatic nerve, or the nerve roots that eventually form it, become irritated or compressed. Common causes include a herniated disc, spinal stenosis, spondylolisthesis, and other conditions affecting the nerves in the lower spine.

That’s why at Desert Valley Chiropractic, we don’t stop at “where does it hurt?” We also want to know: where might this irritation actually be coming from?

Sciatica Is a Symptom, Not a Diagnosis

This distinction matters more than most people realize. Sciatica isn’t one disease — it’s a group of symptoms that can include:

• Pain traveling from the low back or buttock into the leg
• Burning
• Tingling
• Numbness
• Electrical or shooting pain
• Weakness in the leg or foot

The sciatic nerve is the largest nerve in the body. Its roots originate in the lower spine, combine, and travel through the buttock and down the leg — carrying the signals that control leg movement and sensation. When one of those roots gets irritated, you can feel it far downstream.

Think of it like an electrical wire in your house. If the wire inside the wall is damaged, the light fixture at the other end stops working. Changing the bulb doesn’t fix the wire. Sciatica can work the same way — the calf hurts, but the source may be several feet away, in the lower spine.

Common Mechanical Causes

A herniated disc.

Between each vertebra sits a disc that absorbs force and allows movement. When disc material bulges or herniates, it can irritate a nearby nerve root, sending pain, numbness, or tingling into the buttock and leg. This is one of the most common causes of sciatica — but a disc bulge on an MRI doesn’t tell the whole story on its own. Imaging has to be considered alongside your symptoms, exam findings, and neurological signs. We treat the patient, not the MRI report.

Spinal stenosis.

This is a narrowing of the spaces within the spine that puts pressure on nearby nerves, whether from a bulged disc or arthritic changes like facet hypertrophy. Stenosis often behaves differently than a straightforward disc problem — some patients notice worsening leg symptoms while standing or walking, with relief when sitting or leaning forward (a classic sign: relief while riding a bike, since leaning forward can ease pressure on the affected nerves). Details like this help us understand the mechanics and what kind of care might help.

Spondylolisthesis. This is when one vertebra slips forward relative to the one below it, which can narrow the space where nerves exit the spine. Again, the patient’s experience may just be “my leg hurts” — but the leg often isn’t where the problem originates.

Can a Car Accident Cause Sciatica?

Yes. During a collision, sudden forces can affect the muscles, joints, and discs of the low back and pelvis. If that leads to inflammation, disc irritation, or pressure around a nerve root feeding the sciatic nerve, pain can start traveling into the buttock or leg.

Car accidents aren’t the only trigger — we also see sciatic-type symptoms develop after a lifting injury, a fall, a sports injury, repetitive physical work, a sudden twisting movement, or the aggravation of an old low-back or disc issue.

Sometimes the connection is obvious: “I was fine before the accident, and my leg pain started after.” Other times it’s less clear — a person notices low-back stiffness first, with leg symptoms showing up later. And sometimes there’s no single injury at all; symptoms build gradually after years of sitting, repetitive loading, or physical work. That’s why how and when your symptoms started matters just as much as where you feel them now.

Sometimes It Isn’t Actually Sciatica

Sometimes it can be confusing what causes sciatica because not every pain radiating into the buttock or leg comes from the sciatic nerve. Problems involving the muscles, joints, hip, or sacroiliac region — including piriformis syndrome and pelvic injuries — can mimic sciatica closely. So when a patient tells us “I know I have sciatica because my butt hurts,” our job is to actually figure out what’s producing that pain, not assume.

Why Treating Only Where It Hurts Can Miss the Point

Say your calf is burning because a lumbar nerve root is irritated. Massage might help temporarily. Heat might feel good. Stretching might bring short-term relief. But if the irritation is originating higher up, working on the calf alone won’t address the full problem.

That doesn’t mean muscles and soft tissue don’t matter — they can matter a lot. Pain frequently causes muscles to tighten, guard, and compensate. The distinction we’re drawing is between where you feel the symptom and what’s contributing to it. Those aren’t always the same thing.

Your body also starts compensating on its own once the pain sets in — shifting weight to the other side, shortening your stride, sitting differently, avoiding bending, tightening the low back, cutting out exercise. Those adjustments can help short-term, but over time they tend to create a second layer of mechanical problems.

Think of a door that isn’t sitting right on its hinges. You can push and pull on the door all day, but until the hinges are fixed, it’ll keep sticking. Muscles can behave the same way — the tightness is often a response to an underlying joint or movement problem, not the root cause.

Why the Exam Matters

Two people can both have pain running down the right leg and need completely different approaches. That’s why our evaluation goes beyond a pain score. We look at where the symptoms begin, how far they travel, whether there’s numbness, tingling, or weakness, what movements make it better or worse, how sitting and walking affect it, prior injuries and episodes, existing imaging, neurological findings, and how the lumbar spine and pelvis are moving.

We’re looking for a pattern — and the clearer that pattern is, the better we can decide what kind of care actually fits.

The Sciatica Freedom Protocol: Different Problems Need Different Tools

This is the core idea behind our Sciatica Freedom Protocol at Desert Valley Chiropractic: we don’t assume every sciatica patient needs the same treatment. We look at the mechanical components involved and match the approach to the case. Depending on what we find, that might include:

Gentle Activator Method adjustments. Both Dr. Katherine Iacuone and Dr. David Iacuone are advanced certified in The Activator Method — a low-force approach using a handheld instrument to deliver precise, controlled adjustments, rather than traditional manual twisting or cracking. For sciatic-type symptoms, we evaluate movement through the lumbar spine, pelvis, and related joints rather than focusing only on where the leg hurts.

Lumbar spinal decompression. For appropriate patients — particularly when disc or nerve-root involvement appears to be a factor — we may incorporate decompression, which uses controlled traction to change the mechanical forces on the lumbar spine. Not every sciatica patient needs it; the exam helps determine whether it’s the right tool.

Soft-tissue and rehabilitation care. Weeks of limping or guarding can build significant muscular tension and altered movement patterns. Depending on the case, supportive therapies such as shockwave may help address those secondary effects.

The idea is simple: one treatment doesn’t have to do every job. If several mechanical factors are contributing, several tools may be needed.

What About Pain Relief?

Of course we want you to feel better — pain relief matters, especially when sciatica is disrupting sleep, exercise, travel, or a workday. But we don’t stop thinking the moment symptoms ease up.

That matters most for patients who tell us, “I’ve had this three or four times. It always goes away, and then it comes back.” Sciatica commonly improves, but recurrence happens — and for those patients, we want to know what keeps setting it off. That often means looking more closely at the spine, movement patterns, physical demands, and exercise habits.

Should You Avoid Activity When You Have Sciatica?

Not necessarily. Lying down until the pain fully disappears isn’t always the safest approach — some activities may need to be modified temporarily, but prolonged inactivity has its own downsides. A gradual return to tolerable activity and appropriate exercise is often part of conservative care. The key is staying appropriately active without repeatedly pushing through movements that clearly aggravate your nerve symptoms. Listen to the pattern your body is showing you.

When Sciatica Needs Immediate Medical Attention

Most sciatica isn’t an emergency, but certain symptoms shouldn’t wait for a routine appointment. Seek immediate medical evaluation for:

• Sudden or rapidly worsening leg weakness
• Loss of bowel or bladder control
• Numbness in the saddle or genital region
• Severe symptoms following significant trauma

These can signal serious nerve involvement requiring urgent care. Any persistent or unusual symptoms should be evaluated by an appropriate healthcare professional.

Looking for Sciatica Treatment in Phoenix?

If sciatic pain keeps interfering with sitting, driving, exercising, sleeping, or doing the things you enjoy, the first step is figuring out what’s actually contributing to the irritation.

At Desert Valley Chiropractic, our Sciatica Freedom Protocol takes an individualized approach. Depending on your exam and clinical findings, care may include gentle Activator Method adjustments, lumbar spinal decompression, supportive soft-tissue therapies such as shockwave, and rehabilitation or movement recommendations — without traditional twisting, cracking, or popping of the spine.

Most importantly: we don’t believe every patient with leg pain should get the same treatment. If your sciatica keeps coming back, or you’re tired of only treating the spot where it hurts, schedule an evaluation and let us help figure out what’s actually driving the problem.

About Desert Valley Chiropractic

Desert Valley Chiropractic provides gentle, individualized chiropractic care to patients throughout Phoenix and the surrounding area. Our doctors specialize in Activator Methods chiropractic and may incorporate spinal decompression, shockwave therapy, rehabilitation, and other supportive treatments when clinically appropriate. Dr. Katherine Iacuone and Dr. David Iacuone are both advanced certified in the Activator Method and were named to PHOENIX magazine’s 2026 Top Chiropractors list.

Our goal is to help our patients feel better, move better, and live better.

This article is intended for educational purposes and does not diagnose an individual condition or replace personalized medical advice.