What Causes Chronic Low Back Pain? Understanding Symptoms, Diagnosis, and Treatment Options.
Chronic low back pain is one of the most common reasons patients seek medical evaluation and one of the leading causes of disability worldwide. It is defined as pain in the lower back that persists for more than 12 weeks.
While many cases begin with a muscle strain or minor injury, persistent pain often involves structural or neurological causes such as disc degeneration, facet joint arthritis, or nerve irritation.
Understanding the underlying cause is essential for developing an effective treatment plan and improving long-term function.
Common Causes of Chronic Low Back Pain
Chronic low back pain can arise from multiple structures in the spine, often occurring simultaneously rather than from a single identifiable cause.
Degenerative Disc Disease
The intervertebral discs act as cushions between the vertebrae. Over time, these discs can lose hydration and height, which may lead to pain, stiffness, and reduced spinal flexibility.
Facet Joint Arthritis
The facet joints connect the vertebrae and guide spinal movement. Arthritis in these joints can lead to localized back pain, especially with twisting, bending backward, or prolonged standing.
Herniated or Bulging Discs
When a disc bulges or herniates, it may irritate nearby nerve roots. This can cause back pain alone or pain that radiates into the buttock or leg, often referred to as radiculopathy or sciatica.
Spinal Stenosis
Spinal stenosis refers to narrowing of the spinal canal. This can compress nerves and lead to pain, numbness, or weakness in the lower back and legs. Symptoms often worsen with walking or standing and improve with sitting or leaning forward.
Sacroiliac (SI) Joint Dysfunction
The SI joints connect the spine to the pelvis. Dysfunction or inflammation in these joints can cause pain in the lower back, buttocks, or upper legs.
When Should You See a Pain Specialist?
You should consider evaluation by a pain management specialist if:
- You experience new-onset back pain
- Pain persists longer than 6–12 weeks
- Pain interferes with daily activities or sleep
- Conservative treatments such as physical therapy have failed
- You experience radiating pain, numbness, or weakness
- Pain is progressively worsening over time
A specialist can help identify the specific pain generator and develop a targeted treatment plan.
Treatment Options for Chronic Low Back Pain
Treatment is typically individualized and may include both conservative and interventional approaches.
Conservative Treatments
- Core strengthening exercises
- Physical therapy
- Activity modification
- Anti-inflammatory medications
- Chiropractic Care
Interventional Pain Procedures
When conservative treatments are not sufficient, minimally invasive procedures may be considered:
- Epidural steroid injections
- Selective Nerve Root Blocks
- Facet joint injections or medial branch blocks
- Radiofrequency ablation
- Sacroiliac joint injections
- Spinal Cord Stimulator
- Endoscopic laser discectomy
Multidisciplinary Care
Some patients benefit from a combination of:
- Physical rehabilitation programs
- Behavioral pain management strategies
- Coordination with spine surgery when necessary
Conclusion
Chronic low back pain is a complex condition with multiple potential causes, including degenerative, structural, and nerve-related sources. Accurate diagnosis is essential for guiding effective treatment.
A stepwise approach—starting with conservative therapies and progressing to targeted interventional procedures when needed—can significantly improve pain and function for most patients.
It is also worth noting that sciatica—pain radiating from the lower back into the buttock or leg—can occur alongside chronic low back pain, particularly when a herniated disc or a narrowed spinal canal irritates a nerve root. Learn more about what causes sciatica and how it is evaluated and treated.
If you are experiencing persistent low back pain, evaluation by an interventional pain management physician can help identify the underlying cause and guide an individualized treatment plan.
About the Author
Michael Ghermezi, M.D. is a physician specializing in pain management with advanced training in the diagnosis and treatment of acute and chronic pain conditions. He treats patients throughout Southern and Northern California with a focus on minimally invasive, evidence-based pain therapies.
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