Spinal stenosis and a herniated (slipped) disc are two common causes of nerve-related pain in the back and legs. In spinal stenosis, the space around the nerves narrows. In a herniated disc, disc material pushes out and irritates a nerve root. Many people improve without surgery. A smaller group need an operation, and in a few situations it is urgent. The purpose of a specialist assessment is to work out which group you are in and to offer the least invasive treatment that is likely to help.
Spinal stenosis and herniated disc compared
| Feature | Spinal stenosis | Herniated disc |
|---|---|---|
| Typical age | Usually over 50, from age-related wear | Any adult, often 30 to 50 |
| How it starts | Gradually over months or years | Often suddenly, or over days |
| Typical symptom | Leg pain, heaviness or cramping on walking or standing, eased by sitting or bending forward | Sharp, burning or shooting leg pain worse with sitting, bending or coughing |
| Other symptoms | Numbness, tingling, leg weakness or unsteadiness | Numbness, tingling, weakness in the foot or leg |
| Usual course | Tends to persist or slowly progress | Often improves over weeks to months |
The two can occur together, and both can affect the neck as well as the lower back. Cervical problems are covered on our chronic neck and arm pain page.
What the scan can and cannot tell us
An MRI shows narrowing or a disc bulge clearly. What it cannot always show is whether that finding is the cause of your pain. Many people without any symptoms have disc bulges and some narrowing on scans, especially with age. The most reliable approach is to match the scan to your symptoms and examination. If the level of nerve irritation on the scan fits your pain and any weakness or numbness, treatment can be more targeted.
Non-surgical treatment options
Activity and physiotherapy
Staying active, within comfort, is usually better than resting. For stenosis, many people find that forward-flexed activities such as cycling or leaning on a walker are easier than long walks upright, and physiotherapy can build tolerance gradually. For a disc herniation, guided movement helps recovery and reduces fear of moving.
Medicines
NICE advises against opioids for chronic sciatica. Nerve-type pain may respond to other medicines in some people, and we use them with a clear plan to stop them if they do not help. A medicines review is a useful part of the first consultation.
Nerve root and epidural injections
Image-guided injections place local anaesthetic and steroid close to an irritated nerve root. NICE supports considering epidurals for acute and severe sciatica. NICE also advises against epidural injections for neurogenic claudication in people with central canal stenosis, so we choose carefully. Injections usually provide temporary relief, and are best used to make rehabilitation easier or to help decide about surgery.
Radiofrequency and other nerve treatments
When part of your pain comes from the facet joints or sacroiliac joint, which often accompanies stenosis and disc degeneration, diagnostic blocks followed by radiofrequency treatment may be appropriate.
When surgery is the right choice
Surgery to remove a disc fragment or to decompress the narrowed space is considered when there is progressive weakness, when pain is severe and not settling, or when walking is disabling despite good non-surgical care. Cauda equina syndrome is an emergency. We coordinate with spinal surgeons and will tell you plainly when we think a surgical opinion would help you.
Neuromodulation for persistent nerve pain
For people whose leg pain persists, and who do not have a problem that needs surgery, spinal cord stimulation is one option. Dr Poply co-authored the HIDENS study, published in Pain Practice in 2022, of 20 people with non-surgical, intractable lumbar radiculopathy who received high-dose stimulation. It was small and uncontrolled, so it shows what is possible rather than proving the treatment works. NICE recommends spinal cord stimulation for chronic neuropathic pain that has lasted at least 6 months despite conventional treatment, after a successful trial and a multidisciplinary assessment.
Stimulation does not widen a narrowed canal or reverse a disc herniation. It changes how pain signals are processed. Significant narrowing at the levels needed can also make lead placement difficult, so your imaging is reviewed carefully as part of planning.
A practical way to think about timing
- First few weeks. Stay active, use simple measures, and seek help if red flags appear. Most disc-related sciatica begins to improve during this time.
- Several weeks to three months. If severe pain persists, a specialist assessment, targeted injection or a surgical opinion may be appropriate.
- Beyond three months. Pain is now chronic. A broader plan covering rehabilitation, sleep, mood and medicines is usually more effective than a search for a single procedure.
About your specialist
Dr Kavita Poply is a Consultant in Pain Medicine and Neuromodulation at St Bartholomew’s Hospital, London, and a Reader at Queen Mary University of London. She holds Fellowships of the Royal College of Anaesthetists and its Faculty of Pain Medicine. Her practice covers the full ladder of treatment, from injections and radiofrequency to spinal cord stimulation, with NICE guidance as the framework.
Frequently asked questions
Q.1 Can spinal stenosis be treated without surgery?
Ans. Often, yes. Activity, physiotherapy, a review of medicines and targeted injections can reduce symptoms for many people, particularly early on. Surgery is considered when walking is disabling despite good non-surgical care, when there is progressive weakness, or in an emergency such as cauda equina syndrome. Non-surgical care does not reverse the narrowing, but it can reduce how much it affects you.
Q.2 Will a herniated disc heal on its own?
Ans. Many herniated discs shrink over time, and sciatica caused by them often improves over weeks to months without surgery. Recovery varies. If pain is severe, if you develop weakness, or if there are bladder or bowel symptoms, seek assessment sooner. Persistent pain after about three months is worth a specialist review.
Q.3 Are epidural injections good for spinal stenosis?
Ans. It depends on the type of pain. NICE advises against epidural injections for neurogenic claudication in people with central canal stenosis. Injections may be considered for acute and severe sciatica from nerve root irritation. Dr Poply matches the injection to your scan and symptoms, and explains that the effect is often temporary.
Q.4 What is the best treatment for sciatica caused by a slipped disc?
Ans. There is no single best treatment. Most people start with staying active, physiotherapy and simple measures. A nerve root or epidural injection may be considered for severe pain, and surgery is reserved for progressive weakness, emergencies or severe pain that does not settle. The right choice depends on your symptoms, scan, and how long you have had pain.
Q.5 When is surgery needed for spinal stenosis or a disc problem?
Ans. Surgery is usually considered for cauda equina syndrome (an emergency), progressive muscle weakness, severe leg pain that has not settled despite appropriate treatment, or disabling walking difficulty from stenosis. A spinal surgeon makes this decision with you. We can help you weigh up options and arrange a surgical opinion where it would help.