Sciatica: What's Actually Causing Your Pain and How a Chiropractor Can Help

Published on braintobody.com.au | Dr. Izzy Lewis, Chiropractor & Founder of BRAIN TO BODY®

It starts as a dull ache in your lower back. Then it moves. Down through the glute, into the back of the thigh, sometimes all the way to your calf or foot. Some days it's a sharp, shooting pain that stops you mid-step. Other days it's a constant, burning tightness that makes sitting unbearable and standing only slightly better.

If this sounds like your life right now, you've probably already Googled it and landed on the word "sciatica." You're right. But sciatica isn't a diagnosis. It's a description. It tells you which nerve is involved, not why it's involved. And until you figure out the why, nothing you do is going to fix it properly.

At BRAIN TO BODY® in Chippendale, sciatica is one of the most common presentations I see. It's also one of the most misunderstood. So let me break down what's actually happening, what's causing it, and what we can do about it.

What Sciatica Actually Is

The sciatic nerve is the largest nerve in your body. It exits the lower lumbar spine and sacrum, travels through the pelvis, runs deep through the glute, and continues down the back of the leg all the way to the foot. When this nerve is compressed, irritated, or inflamed at any point along its path, you get sciatic pain.

The key word is "any point along its path." This is where most people (and unfortunately, some practitioners) get it wrong. They assume sciatica is always a disc problem. It's not. The sciatic nerve can be irritated at multiple locations, and the cause of the irritation determines the treatment.

The Three Most Common Causes

1. Disc-Related Sciatica

This is the one most people have heard of. A lumbar disc (usually L4-L5 or L5-S1) bulges, herniates, or protrudes posteriorly and compresses one of the nerve roots that form the sciatic nerve. The result is pain that radiates from the lower back down the leg, often accompanied by numbness, tingling, or weakness in the affected leg.

Disc-related sciatica tends to be worse with sitting, bending forward, and coughing or sneezing. It's often worse in the morning when the discs are more hydrated and slightly larger. The pain can be severe, and in some cases the nerve compression causes measurable weakness in the foot or leg muscles.

2. Joint-Related Sciatica

The facet joints in the lumbar spine can become restricted, inflamed, or arthritic, creating local irritation that refers pain into the glute and down the leg in a sciatic pattern. The sacroiliac joint (where the spine meets the pelvis) is another common culprit. When the SI joint is dysfunctional, it can irritate the nearby nerve roots and produce sciatic symptoms.

Joint-related sciatica tends to be more positional. It's often worse with prolonged standing, extension (arching backward), or twisting. It may ease with movement and flexion. The pain pattern can mimic disc-related sciatica, which is why a proper assessment matters.

3. Piriformis Syndrome

The piriformis is a small muscle deep in the glute. In most people, the sciatic nerve runs directly beneath it. In some people, the nerve actually passes through the muscle. When the piriformis is tight, inflamed, or in spasm, it can compress the sciatic nerve and produce pain that radiates down the back of the leg.

Piriformis syndrome tends to produce more glute-dominant pain. It's often worse with sitting (especially on hard surfaces), climbing stairs, or crossing legs. It's common in people who sit for long periods and in runners or athletes who load the glute complex heavily.

Why the Cause Matters

Here's the part most online advice gets wrong. The stretches, exercises, and self-treatment protocols you'll find for sciatica are not universal. What helps disc-related sciatica can make piriformis syndrome worse. What relieves piriformis syndrome can aggravate a disc issue. And joint-related sciatica responds to neither stretching nor extension exercises alone.

This is why a proper assessment is non-negotiable. At BRAIN TO BODY®, the first step is always to determine which of these mechanisms is driving your sciatic pain. The assessment includes orthopaedic testing (specific movement tests that differentiate between disc, joint, and muscular causes), neurological screening (reflexes, sensation, and muscle strength to assess the degree of nerve involvement), and spinal palpation to identify the specific segments and structures involved.

Once we know what's causing it, the plan becomes clear. Until we know, any treatment is a guess.

How Chiropractic Care Treats Sciatica

The approach varies based on the cause, but the principles are consistent: reduce the compression or irritation on the nerve, restore normal motion to the affected joints, and address the underlying pattern that created the problem.

For disc-related sciatica, the treatment focuses on creating space. Specific adjustments to the lumbar spine can reduce pressure on the affected disc and nerve root. Flexion-distraction techniques gently open the disc space and encourage the disc material to centralise. We combine this with directional preference exercises (usually extension-based movements) that help the disc retract away from the nerve.

For joint-related sciatica, the primary intervention is restoring proper motion to the restricted facet joints or sacroiliac joint. When these joints are moving properly, the local inflammation subsides, the nerve irritation resolves, and the referral pattern down the leg clears. Adjustments to the lumbar and pelvic joints are the most direct path to this outcome.

For piriformis syndrome, the approach combines soft tissue work to release the piriformis muscle, pelvic adjustments to address any underlying pelvic asymmetry that's overloading the piriformis, and specific stretching and strengthening protocols to prevent recurrence. If the piriformis is in spasm because the pelvis is sitting unevenly, releasing the muscle without correcting the pelvis is a temporary fix at best.

In all three cases, the goal is the same: get the nerve out of trouble, restore function, and address the structural cause so it doesn't come back.

When Sciatica Needs More Than Chiropractic

I want to be straight about this. Most sciatica responds well to conservative care, including chiropractic. But there are situations where further investigation or a different approach is needed.

If you're experiencing progressive weakness in your foot or leg (not just pain, but actual difficulty lifting your foot or controlling your leg), that suggests significant nerve compression that may require imaging and possibly surgical consultation. If you've lost control of your bladder or bowel function alongside lower back and leg pain, that's a medical emergency called cauda equina syndrome and you need to go to the emergency department immediately.

These scenarios are rare, but they're important to know about. At BRAIN TO BODY®, I screen for these red flags at every assessment. If your presentation suggests something beyond the scope of conservative care, I'll tell you directly and refer you to the right specialist.

The Timeline: How Long Does Sciatica Take to Resolve?

This is the question everyone asks, and the honest answer is: it depends on the cause and severity, but most cases follow a predictable trajectory.

Mild sciatica (piriformis-related or mild joint dysfunction): often shows significant improvement within two to four weeks of care. Full resolution within four to eight weeks.

Moderate sciatica (disc bulge with nerve irritation, significant joint restriction): typically four to eight weeks for substantial relief, with continued improvement over eight to twelve weeks. The leg symptoms usually resolve before the local back pain.

Severe sciatica (large disc herniation, significant nerve compression): this can take longer, sometimes three to six months for full resolution. Progress is usually steady but slower, and the early phase focuses on pain management and preventing worsening before the corrective work begins.

The key predictor of recovery time is how long the issue has been building before treatment starts. A sciatica episode that's been developing for two weeks responds much faster than one that's been worsening for six months. This is one of the strongest arguments for early intervention.

What You Can Do Right Now

If you're currently dealing with sciatic pain and haven't been assessed yet, here are two things you can do today that are safe regardless of the cause:

Walk. Gentle walking (15 to 20 minutes at a comfortable pace) promotes blood flow to the area, encourages disc hydration, and keeps the joints moving without loading them heavily. Walking is one of the few things that helps almost all types of sciatica. Avoid sitting for prolonged periods.

Lie on your back with your knees elevated. Place a pillow under your knees or rest your calves on a chair so your hips and knees are both at roughly 90 degrees. This takes the load off the lumbar spine and sciatic nerve. It's a good resting position when the pain is acute.

Avoid stretching aggressively until you've been assessed. The wrong stretch for your type of sciatica can make things significantly worse.

Don't Wait Until You Can't Walk

Sciatica has a habit of escalating. It starts as an occasional ache, becomes a daily annoyance, then one morning it's a full-blown crisis. The earlier you address it, the faster and more completely it resolves.

If you're dealing with lower back pain that's travelling down your leg, book a visit at BRAIN TO BODY® in Chippendale. I'll find out exactly what's causing it and build a plan to fix it. Not mask it. Fix it.

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Frequently Asked Questions

Can a chiropractor fix sciatica?
Chiropractic care is effective for the majority of sciatica cases, particularly those caused by joint dysfunction, sacroiliac joint issues, piriformis syndrome, and mild to moderate disc involvement. Treatment addresses the cause of the nerve irritation rather than just managing the pain. Severe cases with significant disc herniation may require additional imaging or specialist referral, which a chiropractor can facilitate.

How long does sciatica take to go away with chiropractic treatment?
Most patients experience meaningful relief within two to four weeks of consistent care. Full resolution typically takes four to twelve weeks depending on the cause and severity. Early intervention generally leads to faster recovery times.

What is the best treatment for sciatica?
The best treatment depends on what's causing it. Disc-related sciatica responds to spinal adjustments, flexion-distraction techniques, and extension exercises. Joint-related sciatica responds to specific joint adjustments. Piriformis syndrome responds to soft tissue release, pelvic correction, and targeted stretching. A proper assessment to determine the cause is the essential first step.

Should I stretch if I have sciatica?
Not until you know what's causing it. Certain stretches that help piriformis-related sciatica can worsen disc-related sciatica, and vice versa. Gentle walking is safe for almost all types of sciatica. Beyond that, specific exercise recommendations should be based on a clinical assessment.

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