Causes of Low Back Pain: An Evidence-Based Guide to Symptoms, Diagnosis & Treatment
Understanding the causes of low back pain is essential for proper diagnosis, effective treatment, and long-term prevention. Low back pain is one of the most common health complaints globally and remains a leading cause of disability and work absenteeism. However, low back pain is not a disease by itself. It is a symptom that can arise from multiple underlying conditions ranging from simple muscle strain to inflammatory disorders or, in rare cases, serious systemic disease.
In this comprehensive guide, we explain the main causes of low back pain, how they differ, warning signs to watch for, and when to seek professional physiotherapy treatment.
What Are the Main Causes of Low Back Pain?
Clinically, the causes of low back pain are grouped into six major categories:
- Structural or mechanical causes
- Neoplasms (tumors)
- Referred pain from internal organs
- Spinal infections
- Inflammatory disorders
- Metabolic bone diseases
Each category affects the body differently and requires a distinct clinical approach.
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Causes of Low Back Pain
1. Structural (Mechanical) Causes of Low Back Pain
Structural or mechanical causes account for approximately 80–90% of all low back pain cases. These occur when muscles, joints, discs, ligaments, or vertebrae of the spine are strained, irritated, or degenerated.
In many cases, pain develops due to repetitive strain, prolonged sitting, poor posture, weak core muscles, or improper lifting techniques. While mechanical back pain can be uncomfortable, it is usually not dangerous and responds very well to conservative treatment such as physiotherapy and structured exercise.
Common Structural Conditions
- Mechanical or Non-Specific Low Back Pain
This is diagnosed when no specific structural damage is identified. It often results from muscular strain or joint irritation and improves with movement and rehabilitation. - Facet Joint Arthritis or Dysfunction
The facet joints guide spinal movement. When they become inflamed or arthritic, they can cause localized pain, stiffness, and discomfort during extension or rotation movements. - Prolapsed (Herniated) Intervertebral Disc
A herniated disc occurs when the inner gel-like material of the spinal disc pushes outward and irritates nearby nerves. This may cause radiating leg pain, numbness, or tingling commonly referred to as sciatica. - Annular Tear of the Intervertebral Disc
Small tears in the outer layer of the disc can cause localized inflammation and pain, especially when sitting for prolonged periods. - Spondylolysis and Spondylolisthesis
Spondylolysis is a stress fracture in part of a vertebra, often seen in athletes. When one vertebra slips forward over another, it is called spondylolisthesis, which can compress nerves and cause chronic pain. - Spinal Stenosis
This condition involves narrowing of the spinal canal, which may compress nerves and cause back pain with leg heaviness or weakness, especially during walking.
Most structural causes of low back pain improve significantly with individualized physiotherapy programs.
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2. Neoplasms (Tumor-Related Causes of Low Back Pain)
Tumors are rare causes of low back pain, but they are medically significant. Tumors may originate in the spine (primary tumors) or spread from other parts of the body (secondary or metastatic tumors).
Tumor-related back pain is often constant, progressive, and not relieved by rest. Night pain and unexplained weight loss are particularly concerning symptoms that require urgent medical evaluation.
3. Referred Pain: When the Spine Is Not the Source
Not all causes of low back pain originate in the spine. Sometimes the pain is “referred,” meaning it comes from another structure but is felt in the lower back.
For example, kidney infections or stones may cause flank pain that feels like back pain. Conditions affecting the abdominal aorta, such as aneurysms, may present as deep, persistent back discomfort. Hip joint disorders can also radiate pain into the lower back.
A thorough physical assessment helps distinguish spinal pain from referred pain.
4. Infection-Related Causes of Low Back Pain
Spinal infections such as discitis, osteomyelitis, or paraspinal abscess are uncommon but potentially serious causes of low back pain.
These infections often present with severe, constant pain that does not improve with position changes. Fever, night sweats, and recent infections elsewhere in the body may accompany symptoms.
Immediate medical investigation is essential when infection is suspected.
5. Inflammatory Causes of Low Back Pain
Inflammatory back pain is typically associated with autoimmune conditions such as spondyloarthropathies.
Unlike mechanical pain, inflammatory back pain often improves with activity and worsens with rest. Morning stiffness lasting longer than 30 minutes is a common feature.
Early recognition and coordinated medical and physiotherapy care are important to prevent long-term joint damage.
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6. Metabolic Bone Disorders
Metabolic conditions weaken bone structure and increase fracture risk. Osteoporosis is one of the most common metabolic causes of low back pain, particularly in older adults.
A vertebral compression fracture may occur even after minor trauma in individuals with low bone density. These fractures can cause sudden, sharp back pain and loss of height over time.
Proper screening and rehabilitation are key components of management.
When Is Low Back Pain a Medical Emergency?
Seek urgent care if low back pain is associated with:
- Loss of bladder or bowel control
- Progressive leg weakness
- Fever
- History of cancer
- Unexplained weight loss
These symptoms are considered red flags and require immediate evaluation.
How Physiotherapy Helps Address the Causes of Low Back Pain
For most mechanical and non-specific causes of low back pain, physiotherapy is recommended as first-line treatment in international clinical guidelines.
Evidence-based physiotherapy focuses on:
- Identifying the root cause
- Reducing inflammation and muscle tension
- Restoring mobility
- Strengthening stabilizing muscles
- Preventing recurrence
Exercise therapy, manual therapy, and patient education form the cornerstone of modern back pain rehabilitation.
Why choose Mostfit Physiotherapy Center if you are experiencing low back pain?
If you are experiencing symptoms related to the causes of low back pain, professional evaluation makes all the difference.
Mostfit Physiotherapy Center provides:
- Comprehensive musculoskeletal assessments
- Evidence-based rehabilitation
- Core stabilization programs
- Manual therapy
- Long-term prevention strategies
We focus on treating the root cause of your pain, not just masking symptoms.
Book your back pain assessment appointment with us today
Mostfit Physiotherapy Center
World Class Physiotherapy Services
- Location: Ring Rd Parklands, Nairobi – Inside Kenya Drapers Compound
- Working Hours: 7 AM – 7 PM, Monday to Saturday
- Call/WhatsApp: +254 743 217 360
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If you are experiencing symptoms related to the causes of low back pain, consult the expert physiotherapists at Mostfit Physiotherapy Center in Nairobi for professional evaluation and evidence-based treatment.
Early assessment prevents chronic pain and long-term disability.
Frequently Asked Questions
- What is the most common cause of low back pain?
Mechanical or non-specific back pain is the most common cause and is usually related to muscle strain, posture problems, or joint dysfunction. - How do I know if my back pain is serious?
Back pain is serious if accompanied by neurological symptoms, fever, weight loss, or loss of bladder control. - Can low back pain become chronic?
Pain lasting more than 12 weeks is considered chronic and often requires structured rehabilitation. - Is exercise safe when I have low back pain?
In most cases, guided exercise is not only safe but highly beneficial. Prolonged bed rest is no longer recommended.
References
- World Health Organization. “Low Back Pain.” World Health Organization. Accessed September 16, 2025.
https://www.who.int/news-room/fact-sheets/detail/low-back-pain - National Institute for Health and Care Excellence. “Low Back Pain and Sciatica in Over 16s: Assessment and Management (NG59).” NICE. Accessed September 16, 2025.
https://www.nice.org.uk/guidance/ng59 - American College of Physicians. “Noninvasive Treatments for Acute, Subacute, and Chronic Low Back Pain.” Annals of Internal Medicine. Accessed September 16, 2025.
https://www.acpjournals.org/doi/10.7326/M16-2367 - The Lancet. Hartvigsen J, et al. “What Low Back Pain Is and Why We Need to Pay Attention.” The Lancet. Accessed September 16, 2025.
https://www.thelancet.com/article/S0140-6736(18)30480-X/fulltext - Mayo Clinic. “Back Pain: Symptoms and Causes.” Mayo Foundation for Medical Education and Research. Accessed September 16, 2025.
https://www.mayoclinic.org/diseases-conditions/back-pain/symptoms-causes/syc-20369906
