Dr Colum Nolan
Senior Consultant Spine & Neurosurgeon
MB, BCh, BAO, LRCPSI, MRCSI, FRCSI (Neurosurgery)
Many people assume that the larger a slipped disc is, the more severe the symptoms will be. It is an understandable assumption, yet the reality is often far less straightforward. Some people experience intense pain despite having a relatively small slipped disc, while others with a much larger disc may notice very little discomfort.
Understanding why this happens can help you make better sense of your diagnosis and why slipped disc treatment is based on more than the size of the disc alone.
Why Doesn't Disc Size Always Match Symptom Severity?
The size of a slipped disc is only one factor that influences how severe your symptoms may be. In many cases, other factors play a much bigger role in determining how the condition affects you.
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The Location of the Disc
Where the slipped disc is located can be more important than its size. A small disc herniation that irritates or compresses a spinal nerve may cause significant symptoms. In the cervical or thoracic spine, a herniated disc may also affect the spinal cord. By contrast, a larger disc that extends into an area with more available space may cause few or no symptoms. This is why two slipped discs of different sizes can affect people very differently.
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Which Nerve Is Affected
The nerve affected determines where symptoms occur and whether they involve pain, sensation, muscle strength or reflexes. For example, compression of a cervical nerve root may affect the arm or hand, while compression of a lumbar nerve root may cause leg pain, numbness or weakness. Even a small herniation can therefore have a substantial effect if it compromises a nerve that supports an important movement or function.
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Inflammation Around the Nerve
Symptoms are not caused by pressure alone. When the inner disc material comes into contact with nearby nerve tissue, it can trigger an inflammatory response that irritates the nerve and makes it more sensitive. As a result, some people experience severe pain even when the amount of physical compression appears relatively limited. As the inflammation settles over time, symptoms may also improve.
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Everyone’s Spine Is Different
No two people have exactly the same spinal anatomy. Some naturally have a narrower spinal canal or smaller openings where the spinal nerves leave the spine. When there is less room around a nerve, even a relatively small slipped disc may produce noticeable symptoms. In contrast, someone with more available space around their nerves may tolerate a larger disc herniation with much less discomfort.
Does the Size of a Slipped Disc Affect Treatment?
Although the size of a slipped disc is considered during assessment, it is rarely the deciding factor when planning treatment.
Instead, your spine surgeon considers several factors together, including:
- The severity of your symptoms.
- Whether symptoms are improving or worsening.
- Muscle weakness or changes in sensation.
- How symptoms affect your daily activities.
- Whether conservative treatment has provided relief.
Many slipped discs improve with time, supported by physiotherapy, medication and activity modification. Surgery is generally considered when symptoms persist despite appropriate conservative treatment, neurological function deteriorates or there is significant compression affecting the spinal cord or nerves.
When Should You Seek Medical Advice for a Slipped Disc?
A small slipped disc can sometimes cause significant symptoms, so it is important not to judge the severity of your condition based on disc size alone. Instead, pay attention to how your symptoms change over time.
You should arrange a medical assessment if you experience:
- Persistent pain that does not improve with conservative treatment.
- Pain that radiates into the leg or arm.
- Increasing numbness or tingling.
- Muscle weakness affecting grip strength, walking or balance.
- Symptoms that are interfering with work, sleep or daily activities.
Seek urgent medical attention if you develop:
- Loss of bladder or bowel control.
- Numbness around the buttocks or inner thighs.
- Rapidly worsening weakness in the arms or legs.
Early assessment allows your symptoms to be evaluated promptly and helps determine whether your condition can continue to be managed conservatively or requires further treatment.
Looking Beyond Disc Size with Dr Colum Nolan
Living with a slipped disc can be frustrating, particularly when your symptoms do not seem to match what you have been told about the condition. A comprehensive assessment can help identify what is contributing to your symptoms and guide treatment based on your individual needs rather than assumptions about disc size.
At Oxford Spine & Neurosurgery Centre in Singapore, care is provided by Dr Colum Nolan, who offers comprehensive assessment and personalised treatment recommendations for slipped discs and other spinal conditions. If you have been diagnosed with a slipped disc, are experiencing symptoms that are not improving or would like a second opinion, arrange a consultation to discuss the most appropriate treatment options.
Frequently Asked Questions About Slipped Disc Symptoms
Can a slipped disc shrink over time?
Yes. In many cases, the body gradually breaks down and reabsorbs part of the herniated disc through a natural healing process. As this occurs, pressure and irritation around the affected nerve may lessen, leading to an improvement in symptoms.
Why does a slipped disc cause pain in the arm or leg instead of the back?
A slipped disc often irritates a spinal nerve rather than the muscles or joints of the spine itself. Because spinal nerves travel into the arms or legs, pain may be felt further away from the site of the slipped disc. This is known as referred nerve pain, such as sciatica in the lower back.
Are there activities I should avoid with a slipped disc?
During the early stages, it is generally advisable to avoid activities that significantly worsen your symptoms, such as heavy lifting, repetitive twisting or prolonged sitting. However, complete bed rest is usually not recommended, as gentle movement and appropriate activity often support recovery.
Meet Our Spine Specialist in Singapore
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.
