Dr Colum Nolan
Senior Consultant Spine & Neurosurgeon
MB, BCh, BAO, LRCPSI, MRCSI, FRCSI (Neurosurgery)
Spinal discs are subjected to repeated mechanical stress throughout daily life. Over time, changes in their structure can affect how effectively they absorb and distribute these forces. Disc degeneration is one process that can alter these properties, potentially making a disc more vulnerable to damage.
One possible consequence of structural damage is disc herniation, which occurs when disc material becomes displaced beyond its normal boundaries. Although degeneration can contribute to the conditions that make herniation more likely, the two are not interchangeable.
What Happens to a Spinal Disc as It Degenerates?
Spinal discs sit between adjacent vertebrae and help cushion the spine during movement. Each disc has a soft, gel-like centre called the nucleus pulposus, surrounded by a tougher outer ring known as the annulus fibrosus. The nucleus pulposus helps absorb compressive forces, while the annulus fibrosus provides structural support and helps contain the inner material.
As degeneration develops, several changes may occur:
- Disc dehydration: The nucleus pulposus gradually loses water content as its composition changes, reducing the disc’s ability to distribute pressure effectively.
- Reduced disc height: Changes in the disc’s internal structure may cause it to lose height, altering how forces are distributed across the spinal segment.
- Deterioration of the outer ring: The annulus fibrosus may develop structural weaknesses and small fissures as its fibres undergo degenerative changes.
These changes can develop gradually and do not necessarily cause symptoms.
How Can Disc Degeneration Contribute to Herniation?
As the outer ring of a spinal disc weakens, it may become less able to contain the material within the disc under mechanical stress. Disruption of the annulus fibrosus may allow disc material to extend beyond its normal boundaries, resulting in a herniated disc.
The likelihood of herniation depends on more than the presence of degeneration alone. Factors such as the disc’s remaining structural integrity and the forces acting on it may influence whether herniation occurs. Degenerative changes seen on MRI therefore cannot reliably predict whether an individual disc will herniate.
What Symptoms Can Disc Degeneration and Herniation Cause?
Disc degeneration and herniation can both occur without causing noticeable symptoms. When symptoms develop, their nature may depend on whether nearby nerve structures are affected.
- Localised spinal symptoms: Degenerative disc changes may be associated with neck or lower back pain and stiffness. A herniated disc can also cause pain in the affected spinal region.
- Nerve-related symptoms: If herniated disc material irritates or compresses a spinal nerve root, pain may radiate into an arm or leg, sometimes accompanied by numbness or muscle weakness. Other degenerative spinal conditions can also affect nerve roots and produce similar symptoms.
Symptoms alone cannot reliably establish which disc changes are responsible. MRI may reveal degeneration and herniation in the same spinal region, including abnormalities that are not causing symptoms. Clinical findings must therefore be considered along with imaging to determine whether a particular disc abnormality explains the patient’s symptoms.
Can You Reduce the Risk of a Herniated Disc?
Although age-related disc changes cannot be entirely avoided, certain habits may help manage mechanical strain and support spinal health. However, these measures cannot guarantee that a disc will not herniate.
Some practical considerations include:
- Staying physically active: Regular exercise helps maintain the strength and endurance of muscles that support the spine. Activities can be adjusted to individual fitness levels and existing spinal symptoms.
- Managing spinal loading: Using appropriate lifting techniques and gradually increasing physical demands may help limit excessive stress on spinal structures, particularly during repetitive or strenuous activities.
- Maintaining a healthy weight: Managing excess body weight may reduce mechanical loading on the lumbar spine and support overall spinal health.
- Avoiding smoking: Smoking is associated with disc degeneration and may impair the supply of nutrients to spinal disc tissues.
Don't Let Spinal Disc Problems Slip Past You
If signs of disc degeneration have been identified, it may be worth reviewing the physical demands placed on your spine and considering whether adjustments to your daily activities could help reduce unnecessary strain. Early attention to these demands may help limit avoidable stress on already vulnerable discs, although no measure can eliminate the possibility of herniation.
At Oxford Spine & Neurosurgery Centre, Dr Colum Nolan provides specialist evaluation of degenerative spinal conditions and disc herniation. His clinical experience can help inform recommendations for managing existing disc problems and determining when treatment for a herniated disc may be appropriate.
If you have been diagnosed with disc degeneration and are concerned about further disc damage, arrange a consultation to discuss appropriate steps for protecting your spinal health.
Frequently Asked Questions (FAQs) About Disc Degeneration and Herniated Discs
Can a degenerated disc repair itself?
The structural changes associated with disc degeneration generally cannot be fully reversed. Spinal discs have a limited capacity for self-repair, partly because they have a relatively poor blood supply. However, symptoms may improve even when degenerative changes remain visible on imaging.
Can you continue exercising if you have disc degeneration?
Yes. Most people with disc degeneration can continue exercising, and staying active is generally beneficial for spinal health. Low-impact activities such as walking, swimming and cycling may be suitable starting points, with exercise intensity adjusted according to symptoms and physical ability. Activities that consistently worsen pain may need to be modified, particularly if nerve-related symptoms develop.
Can a herniated disc heal without surgery?
Yes. Many herniated discs improve without surgery, and some become smaller over time as the body gradually absorbs displaced disc material. Pain and other symptoms may improve over several weeks to months, although recovery varies. Surgery is generally considered when symptoms remain disabling despite appropriate non-surgical care or when significant neurological problems develop.
Meet Our Doctor
Dr Colum Nolan
Senior Consultant Spine & Neurosurgeon
MB, BCh, BAO, LRCPSI, MRCSI, FRCSI (Neurosurgery)
Dr Colum Nolan is a senior consultant spine and neurosurgeon, as well as the Medical Director of Oxford Spine & Neurosurgery Centre. He undertook specialist neurosurgery training in Ireland and Australia, and later on completed a complex spine surgery fellowship at Addenbrooke’s Hospital in Cambridge, UK.
Dr Colum held key leadership roles including Director of the Spine and Spinal Disorders Programme at the National Neuroscience Institute (NNI), as well as the Head of Neurosurgery Service at Sengkang General Hospital.
With his depth of experience, Dr Colum is committed to guiding each patient towards the safest and most effective treatment for their needs.
