Lumbar spondylosis develops as the structures of the lower spine gradually change with age and repeated mechanical stress. The discs between the vertebrae can lose some of their height and flexibility, while the joints and bones of the spine may also develop degenerative changes. These changes are common, and they do not always cause symptoms.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Age is the most important risk factor, but it is not the only one. Previous back injuries, physically demanding activities, excess body weight, smoking and certain occupational stresses may also contribute to degenerative changes or increase the likelihood of developing symptoms.
If you want to understand how these changes are diagnosed and managed, the Lumbar Spondylosis Treatment guide provides a broader overview of the condition.
What Causes Lumbar Spondylosis?
Lumbar spondylosis is not usually caused by one specific event. It is generally the result of gradual changes affecting different structures of the lumbar spine. Over time, several changes may occur:
- Intervertebral discs can lose water and become less flexible.
- Discs may become thinner and lose some of their ability to absorb load.
- The small facet joints at the back of the spine can develop cartilage wear.
- Bone spurs, known as osteophytes, may develop along the edges of vertebrae.
- Ligaments around the spine may become thicker or less flexible.
- The spaces through which nerves travel may become narrower.
These changes can occur together. In some people, they remain painless. In others, they can contribute to lower back pain, stiffness or narrowing around spinal nerves.
Is Lumbar Spondylosis Simply a Result of Getting Older?
Age-related degeneration is the main underlying factor, but lumbar spondylosis is more complicated than simply “wear and tear.”
Degenerative changes in the spine become increasingly common with age, even among people who have no back pain. This means that finding spondylosis on an X-ray or MRI does not necessarily mean that it is the cause of a person's symptoms.
Age increases the likelihood of structural changes, while factors such as body weight, physical loading, previous injury and smoking may influence how those changes develop or whether they become symptomatic.
How Do Spinal Discs Change With Age?
The discs between the vertebrae act as cushions and help the spine move. They contain a water-rich inner portion surrounded by a stronger outer layer.
With aging, discs tend to lose water and become less flexible. Their ability to withstand and distribute mechanical loads can change, and the disc may gradually lose height.
As disc height decreases, the way forces are distributed through the surrounding joints and spinal structures can also change. In some people, these changes contribute to further degeneration and narrowing around the nerves.
Who Is More Likely to Develop Lumbar Spondylosis?
Anyone can develop degenerative changes in the lumbar spine, but certain factors are associated with a greater likelihood of developing them or experiencing symptoms.
1. Older adults
Age is the strongest risk factor. Degenerative changes in the discs, joints and other spinal structures become increasingly common as people get older.
However, age alone does not determine whether you will have pain. Some older adults have substantial degenerative changes without significant symptoms, while others develop considerable discomfort from relatively modest structural changes.
2. Previous back injury
A previous injury to the spine can alter the mechanics of the affected area and may contribute to degenerative changes over time.
Injuries involving the discs, vertebrae or spinal joints can sometimes increase the stress placed on surrounding structures.
A previous injury does not mean that lumbar spondylosis will inevitably develop, but it can be one factor considered when assessing a person's spinal health.
3. Physically demanding work
Jobs involving repeated heavy lifting, frequent bending, twisting or other substantial physical loading can place considerable stress on the lower back.
Occupational exposure to whole-body vibration, such as prolonged driving of certain heavy vehicles or machinery, has also been associated with low back problems.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
However, physical activity itself is not inherently harmful to the spine. Regular, appropriately performed movement is generally an important part of maintaining overall physical function.
4. Excess body weight
Higher body weight can increase the mechanical load placed on the lumbar spine. Obesity has also been associated with a greater prevalence of spinal degeneration and low back problems.
Weight is only one factor, however. People with lower body weight can also develop lumbar spondylosis, particularly as they age.
5. Smoking
Smoking is associated with poorer disc health and an increased risk of degenerative disc changes. Tobacco exposure can affect blood flow and tissue health, while substances in tobacco smoke may also interfere with processes involved in maintaining spinal disc tissue.
6. Genetic and biological factors
Not everyone develops spinal degeneration at the same rate. Research suggests that genetic factors can influence susceptibility to disc degeneration and other age-related spinal changes.
This helps explain why two people of similar age, activity level and body weight may have very different findings on spinal imaging.
7. Repetitive mechanical stress
The lumbar spine carries much of the body's load and moves frequently throughout the day. Repeated bending, lifting and twisting can increase mechanical demands on the lower back.
Long-term exposure to high physical loads may contribute to degenerative changes in susceptible individuals, particularly when combined with other risk factors.
Can Poor Posture Cause Lumbar Spondylosis?
Poor posture is often blamed for lumbar spondylosis, but the relationship is more complicated. Posture can influence how forces are distributed through the spine and may contribute to temporary muscle strain or discomfort.
However, there is not enough evidence to say that simply sitting or standing with “bad posture” is a direct cause of lumbar spondylosis.
Long periods of sitting, especially without changing position, can aggravate back symptoms in some people. Regular movement and changing positions may be more useful than trying to maintain one “perfect” posture throughout the day.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Can Lack of Exercise Cause Lumbar Spondylosis?
Physical inactivity is not considered a single direct cause of lumbar spondylosis. However, low physical activity can contribute to reduced muscle strength, poorer physical conditioning and weight gain, which may affect back health.
Regular physical activity can help maintain strength, mobility and general function. Exercise is also commonly included in conservative treatment programs for people who already have symptoms from lumbar degenerative conditions. The appropriate type and intensity of exercise depend on the individual's symptoms and overall health.
Why Do Some People Have Severe Changes but No Pain?
This is an important feature of lumbar spondylosis. Imaging can show disc degeneration, bone spurs or other structural changes in people who have little or no back pain. Conversely, someone with relatively modest imaging findings may experience significant symptoms.
Pain is influenced by more than what can be seen on an X-ray or MRI. Nerve irritation, inflammation, surrounding muscles and joints, individual pain sensitivity and other factors can all contribute to how a person experiences symptoms.
For this reason, doctors generally interpret imaging findings alongside the person's symptoms and physical examination rather than treating an imaging finding in isolation.
Risk Factors vs Causes: What Is the Difference?
It is useful to distinguish between a cause and a risk factor. The degenerative process behind lumbar spondylosis develops through changes in the spinal discs, joints, bones and other tissues over time.
Factors such as age and genetics influence the likelihood and rate of these changes, while smoking, excess body weight, previous injury and repeated physical loading may contribute to spinal degeneration or associated symptoms.
Having a risk factor does not mean that you will definitely develop symptomatic lumbar spondylosis. Likewise, someone without obvious risk factors can still develop degenerative changes.
The Bottom Line
Lumbar spondylosis develops primarily through gradual age-related changes in the discs, joints, bones and other structures of the lower spine. Age is the strongest risk factor, but previous injury, repeated physical loading, excess body weight, smoking and genetic susceptibility may also influence spinal degeneration or the likelihood of developing symptoms.
Importantly, having these risk factors—or seeing spondylosis on an imaging scan—does not automatically mean that you will have significant back pain. Degenerative changes are common even in people without symptoms.
While age-related degeneration cannot be completely prevented, maintaining physical activity, supporting a healthy body weight, avoiding smoking and taking sensible approaches to physically demanding activities can contribute to overall spinal and musculoskeletal health.
