What Is Sciatica?
Sciatica refers to pain that radiates along the path of the sciatic nerve — the longest and thickest nerve in the human body. The sciatic nerve originates from nerve roots in the lower lumbar and upper sacral spine (L4, L5, S1, S2, S3), travels through the pelvis, passes deep through the buttock beneath the piriformis muscle, and runs down the back of each leg to the foot. When this nerve is compressed, irritated, or inflamed at any point along its course, the result is the characteristic pattern of pain, numbness, tingling, or weakness that extends from the lower back through the buttock and down one leg.
It's important to understand that sciatica is not a diagnosis in itself — it's a symptom. The radiating leg pain is the signal; the underlying cause is what needs to be identified and treated. That's why a thorough assessment to determine exactly where and why the nerve is being compressed is the critical first step toward lasting relief.
What Causes Sciatic Nerve Compression?
The most common cause of sciatica is a lumbar disc herniation — when the soft inner material of a spinal disc pushes through a weakened area in the outer wall and presses against an adjacent nerve root. This accounts for roughly 90% of sciatica cases and most frequently involves the L4-L5 or L5-S1 disc levels. Disc herniations can result from a single heavy lifting episode, a motor vehicle accident, cumulative wear from repetitive bending and twisting, or gradual age-related disc degeneration.
Other causes include lumbar spinal stenosis — a narrowing of the spinal canal that compresses the nerve roots, particularly in older adults — and spondylolisthesis, where one vertebra slips forward on the one below it. Piriformis syndrome is another common but frequently overlooked cause, occurring when the piriformis muscle in the deep buttock spasms or tightens and compresses the sciatic nerve as it passes underneath. Sacroiliac joint dysfunction can also refer pain into the buttock and leg in patterns that mimic true sciatica.
In the Okanagan, we commonly see sciatica triggered by heavy lifting during vineyard and orchard seasons, prolonged sitting in poorly configured home offices, high-impact activities like mountain biking and skiing, and trauma from motor vehicle accidents on Highway 97. If your sciatica followed an MVA, your treatment may be fully covered under ICBC's 25 pre-approved chiropractic visits.
Chiropractic Treatment vs. Other Approaches
When sciatica strikes, patients often face a confusing range of treatment options — from medication and cortisone injections to physiotherapy and surgery. Current clinical evidence consistently supports conservative care, including chiropractic treatment, as the recommended first-line approach for most cases of sciatica. Here's how the options compare.
Medication — typically NSAIDs, muscle relaxants, or prescription pain relievers — can provide temporary symptom relief but does nothing to address the mechanical cause of nerve compression. The pain returns when the medication wears off, and long-term use carries significant side-effect risks. Cortisone injections offer a similar limitation: they reduce inflammation around the nerve root temporarily, but the underlying disc herniation, stenosis, or joint dysfunction remains unchanged.
Chiropractic care addresses the cause directly. Spinal adjustments restore proper alignment and joint mechanics in the lumbar spine, reducing pressure on the compressed nerve root. Flexion-distraction technique — a gentle, non-thrusting approach particularly effective for disc herniations — creates negative intradiscal pressure that helps retract bulging disc material away from the nerve. Active Release Technique breaks down the adhesions and muscular restrictions that contribute to piriformis syndrome and soft tissue nerve entrapment. And targeted rehabilitation exercises rebuild the core stability needed to maintain spinal alignment and prevent recurrence.
Surgery — typically microdiscectomy for disc herniations — is generally reserved for cases involving progressive neurological deficit, significant leg weakness, or bowel and bladder dysfunction, or when conservative treatment has not provided adequate relief after several months. The majority of sciatica patients recover fully with chiropractic care and never require surgical intervention.
What to Expect at Okanagan Chiropractic Center
Your first visit begins with a comprehensive 45-minute assessment. Your chiropractor will take a detailed history of your pain pattern — when it started, what makes it better or worse, how far down the leg it travels, and whether you experience numbness, tingling, or weakness. This is followed by a thorough physical examination including orthopedic testing specific to sciatic nerve involvement (such as the straight leg raise test), neurological screening of reflexes, sensation, and muscle strength, lumbar range of motion assessment, and palpation of the lumbar spine, sacroiliac joints, and piriformis.
Based on these findings, your chiropractor will explain your diagnosis, identify the specific structure compressing the nerve, and outline a treatment plan with clear milestones. Most patients receive their first treatment during the initial visit. As your symptoms improve, treatment frequency is reduced and the focus shifts toward strengthening and prevention — rebuilding the core stability and movement patterns that protect against recurrence.