Chronic back pain has nine common structural and functional causes: annular tears, degenerative disc disease, herniated discs, facet joint arthritis, sciatica, spinal stenosis, sacroiliac joint dysfunction, muscular imbalance, and failed back surgery syndrome. Identifying the correct cause is the first step toward a targeted non-surgical treatment plan.

Back pain is the leading cause of disability worldwide, and roughly 30% of US adults report recent low back pain. When pain persists beyond twelve weeks, it crosses into chronic territory — and the right treatment depends entirely on the right diagnosis. This listicle ranks the nine most common drivers of chronic back pain that we evaluate at ValorSpine and explains how each is typically addressed without surgery. For a complete map of conservative options, see our non-surgical spine treatment guide, or compare specific approaches in our non-surgical spine treatment comparison.

If you are weighing alternatives to fusion specifically, our spinal fusion alternatives hub covers the broader decision framework. The list below is ordered by how often each cause shows up in chronic-pain consultations.

Comparison: Chronic Back Pain Causes at a Glance

1. Annular Tears in the Disc Wall

Annular tears are fissures in the tough outer ring of the spinal disc. They are one of the most under-diagnosed sources of chronic axial low back pain because routine MRI reports often note them in passing without connecting them to symptoms. Tears allow inflammatory mediators from inside the disc to reach pain-sensitive nerve fibers in the outer annulus.

• Pain is typically deep, central, and worse with sitting or bending
• High-intensity zones (HIZ) on T2 MRI are a classic sign
• Annular tears are the direct target of intra-annular fibrin injection
• Conservative care alone often fails when the tear remains unsealed

Verdict: If imaging confirms an annular tear and conservative care has stalled, this is a high-yield candidate for biologic disc repair.

2. Degenerative Disc Disease

Degenerative disc disease (DDD) describes the gradual dehydration, height loss, and structural wear of one or more spinal discs. It is not a disease in the traditional sense — it is a wear pattern that becomes painful when the disc loses its ability to absorb load and small tears develop in the annulus.

• Stiffness in the morning and after prolonged sitting is common
• Activity-related aching that improves with light movement
• Imaging shows reduced disc height and dark (dehydrated) discs
• Often coexists with annular tears, which drives the pain signal

Verdict: DDD itself is structural, but the pain piece is usually treatable with biologic repair plus targeted rehab.

3. Herniated or Bulging Disc

A herniated disc occurs when inner disc material pushes through a tear in the annulus and contacts a nerve root. Most herniations resolve with time and conservative care — about 80–90% of sciatica cases driven by disc herniation improve without surgery.

• Radiating pain, numbness, or weakness in the leg or arm
• Symptoms often follow a clear nerve root distribution
• Sealing the underlying annular tear can prevent recurrence
• Surgery is reserved for progressive neurologic deficits

Verdict: Conservative care first; consider biologic disc repair when pain persists past three months.

4. Facet Joint Arthritis

The facet joints are paired joints at the back of each spinal segment. They develop arthritic changes from years of load and asymmetric movement. Facet pain is a frequent driver of chronic low back pain in older adults and in patients with prior fusion.

• Pain worsens with extension, rotation, or standing
• Often localized to one or both sides of the spine
• Diagnostic medial branch blocks confirm the source
• Targeted injections and motion-control rehab are the mainstay

Verdict: Facet pain rarely needs surgery; the right injection plus rehab usually handles it.

5. Sciatica and Lumbar Radiculopathy

Sciatica is a symptom, not a diagnosis. It describes nerve root irritation that radiates down the leg, most commonly from a herniated disc or foraminal stenosis. The encouraging fact: 80–90% of sciatica cases resolve without surgery when the underlying cause is addressed.

• Sharp, electric, or burning pain from buttock to calf or foot
• Worse with sitting, coughing, or forward bending
• Treatable through the disc-level cause when imaging confirms it
• Persistent cases benefit from biologic repair of the source disc

Verdict: Treat the cause, not the symptom — most sciatica resolves with the right targeted plan.

6. Spinal Stenosis

Spinal stenosis is narrowing of the spinal canal or nerve foramina, usually from a combination of disc bulging, ligament thickening, and bony overgrowth. It is the most common reason older adults are told they need surgery — yet many do well with structured non-surgical care.

• Pain or heaviness in the legs with standing or walking
• Relief with sitting or leaning forward (the “shopping cart sign”)
• Decompression-based physical therapy is first-line
• Surgery is reserved for progressive functional loss

Verdict: Nearly 1 in 5 patients told they need spine surgery choose not to have it — many of those are stenosis cases doing well non-surgically.

7. Sacroiliac Joint Dysfunction

The sacroiliac (SI) joints sit between the sacrum and pelvis. They are a common but frequently missed source of low back and buttock pain, especially after pregnancy, falls, or prior lumbar fusion that shifts load onto the pelvis.

• One-sided low back or buttock pain that does not radiate below the knee
• Provocation testing is more reliable than MRI
• SI-specific stabilization rehab is highly effective
• Targeted injections confirm the diagnosis and reduce inflammation

Verdict: If your imaging looks clean but pain is one-sided and pelvic, ask about the SI joint.

8. Muscular Imbalance and Postural Load

Not all chronic back pain comes from a structural lesion. Years of prolonged sitting, weak deep stabilizers, and asymmetric loading produce diffuse, posture-driven pain that imaging cannot explain. This is one of the most common causes of “my MRI is normal but I still hurt.”

• Diffuse aching, worse at the end of the day
• Improves with movement, worsens with static postures
• Imaging is typically unremarkable
• Structured rehab focused on hip and trunk control resolves most cases

Verdict: A normal MRI plus chronic pain often points here — not to a missed surgical lesion.

9. Failed Back Surgery Syndrome

Failed back surgery syndrome (FBSS) describes persistent or recurrent pain after spine surgery. Roughly 40% of back surgeries do not achieve the patient’s desired outcome, and revision rates can exceed 20% within 10 years. Many FBSS patients still have a treatable cause at the original or adjacent level.

• Pain that returns weeks to years after fusion or discectomy
• Adjacent segment disease above or below a fusion
• Untreated annular tears at the original level
• Published data show 80% of FBSS patients improved with intra-annular fibrin injection

Verdict: A second surgery is rarely the answer — re-evaluate for a non-surgical, biologic option first. See our guide on how to avoid spinal fusion surgery and our framework for talking to your surgeon about non-surgical options.

How We Evaluated These Causes

This ranking reflects the diagnostic mix we see in chronic-pain consultations at ValorSpine, weighted against published prevalence data and clinical guideline frameworks. Causes are ordered by frequency of presentation among patients who have failed at least one round of conservative care, not by absolute population prevalence. Each entry was cross-checked against AAFP and NINDS clinical references and against published outcome data for the relevant non-surgical therapy. We deliberately excluded rare or red-flag causes (tumor, infection, fracture) because those require urgent surgical or medical work-up rather than chronic-pain pathways.

Frequently Asked Questions

Which cause of chronic back pain is most often missed?

Annular tears are the most frequently under-diagnosed driver of axial low back pain. They appear on MRI but are often described as incidental, even when they correlate with the patient’s exact symptom pattern. SI joint dysfunction is a close second.

How long should I try conservative care before considering biologic disc repair?

Most clinical frameworks suggest at least 6 to 12 weeks of structured conservative care — physical therapy, activity modification, and short-term medication — before considering interventional options. If pain persists past three months and imaging confirms a treatable disc lesion, biologic disc repair becomes a reasonable next step.

Can chronic back pain have more than one cause at the same time?

Yes. It is common for a single patient to have annular tears, mild degenerative changes, and muscular imbalance simultaneously. The treatment plan should address the dominant pain generator first, then layer in rehab to handle the contributing factors.

Does a normal MRI mean my pain is not real?

No. Muscular imbalance, SI joint dysfunction, and early facet pain often produce significant chronic pain with unremarkable MRI findings. A normal scan rules out major structural lesions but does not rule out treatable functional causes.

When is surgery actually necessary?

Surgery is clearly indicated for progressive neurologic deficits, cauda equina syndrome, instability, fracture, infection, or tumor. For most chronic mechanical back pain, surgery is one option among several — and not the first one to consider.

Sources & Further Reading

• American Academy of Family Physicians — clinical guidelines on low back pain evaluation
• National Institute of Neurological Disorders and Stroke — overview of low back pain causes and management
• Journal of Neurosurgery — outcome data on lumbar spine surgery and revision rates
• Pain Physician — published cohort data on intra-annular fibrin injection outcomes
• U.S. Department of Veterans Affairs — chronic pain prevalence and musculoskeletal claim data
• ValorSpine clinical experience — non-surgical spine consultation patterns, 2024–2026

Next Steps

Most chronic back pain has a treatable, non-surgical cause once the right diagnosis is made. For deeper reading, our guide to evaluating spine treatment options walks through the decision framework, and our spine treatment recovery FAQ answers common timeline questions.

Ready to explore non-surgical options for your back pain? Schedule your consultation with ValorSpine today.