Numbness around the genitals or back passage, difficulty passing urine, or weakness in both legs needs emergency surgery within hours. This is cauda equina syndrome. Go to the nearest hospital immediately — delay causes permanent bladder and sexual dysfunction.
Part of a spinal disc bulges out and presses on a nerve root, sending pain, numbness or weakness down the leg. Most cases settle without any operation, and the disc fragment often shrinks on its own.
The most useful thing to know is that time is on your side in most cases. Around three quarters of people with sciatica from a disc improve substantially within six to twelve weeks without surgery.
Spinal discs sit between the vertebrae, with a tough fibrous outer ring and a softer gel-like centre. With age and loading, the outer ring can tear and allow the inner material to bulge or extrude, pressing on the nerve root emerging beside it.
The result is not usually back pain but leg pain — sciatica — following the path of the compressed nerve, with numbness or weakness in the muscles that nerve supplies. Where the pain travels tells the examining doctor which level is affected, often more precisely than the scan.
The natural history is genuinely favourable. The extruded fragment provokes an inflammatory response that gradually breaks it down, and repeat scans frequently show it has shrunk or disappeared. Around three quarters of patients improve substantially within six to twelve weeks with conservative treatment alone.
That said, three situations change the calculation: severe or progressive weakness, pain that remains disabling despite six to twelve weeks of proper treatment, and cauda equina syndrome — compression of the whole bundle of nerves at the base of the spine, which is a surgical emergency.
A large central disc prolapse can compress the entire bundle of nerves at the base of the spinal canal. The warning signs are numbness in the saddle area — the genitals, inner thighs and around the back passage — difficulty starting or feeling the passage of urine, loss of bowel control, and weakness in both legs. This needs an urgent MRI and surgery within hours, at the nearest capable hospital. Delay causes permanent incontinence and sexual dysfunction, and it is one of the few spinal situations where waiting even a day changes the outcome permanently. Do not arrange travel for this.
The examination localises it; the scan confirms it.
Whether the pain goes to the top of the foot, the sole, the outer calf or stops at the knee tells us which nerve root is compressed, and that must match the level on the scan. If they do not match, an operation on the level seen on the scan will not help you. Send the MRI report and images, together with a clear description of the pain's path, any numbness, any weakness, and how long you have had it.
Time and conservative treatment resolve most cases without an operation.
Simple analgesia, anti-inflammatory medication, drugs for nerve pain where appropriate, staying active rather than resting in bed, and physiotherapy. Most patients improve substantially over six to twelve weeks. Bed rest beyond a day or two makes things worse rather than better.
Steroid injected around the compressed nerve root under image guidance. It reduces inflammation and can relieve pain substantially for weeks to months, sometimes long enough for the disc to resolve naturally. It is also diagnostic — good relief confirms that level is the source.
A small opening and removal of the fragment pressing on the nerve. It relieves leg pain reliably and quickly, and most patients go home within two days. It treats leg pain far better than back pain — patients whose main complaint is back pain are frequently disappointed, and should be told so beforehand.
Immediate surgery for cauda equina syndrome. The aim is to relieve pressure before permanent damage to bladder, bowel and sexual function occurs. Outcomes depend heavily on how quickly it is done, which is why this is treated locally and immediately.
Leg pain responds well to surgery. Back pain does not. This determines whether an operation is worth having.
Under six weeks, continued conservative treatment is usually right. Beyond twelve weeks with disabling pain, surgery becomes more clearly worthwhile.
Significant or progressive weakness shifts the balance towards operating sooner rather than waiting.
If you have had sciatica for three weeks and your main problem is leg pain, we will suggest waiting and treating it properly first. Most people in that situation get better without us.
Cauda equina syndrome is treated within hours at the nearest hospital. No amount of travel arrangement can be made fast enough.
Photographs taken on your phone are fine. Reports in Arabic, Russian or Bengali are fine — we translate them ourselves.
Very often, yes. Around three quarters of people with sciatica from a disc improve substantially within six to twelve weeks with conservative treatment, and repeat scans frequently show the fragment has shrunk or disappeared. This is why waiting is a legitimate first strategy rather than a delay tactic.
Generally six to twelve weeks of proper conservative treatment, unless there is significant weakness or cauda equina symptoms, which change the timing entirely. Operating very early does produce faster relief, but by one to two years the results converge — so the main benefit of early surgery is speed rather than a better eventual outcome.
Probably not much. Microdiscectomy reliably relieves leg pain by taking pressure off the nerve, but it does considerably less for pain confined to the back itself. If back pain is your main complaint, be cautious about any surgeon who promises it will resolve, and ask specifically what improvement they expect in your back pain.
Compression of the whole bundle of nerves at the base of the spinal canal, usually by a large central disc prolapse. It causes numbness around the genitals and back passage, difficulty passing urine, and weakness in both legs. It requires surgery within hours, because delay causes permanent incontinence and sexual dysfunction.
No, beyond a day or two at most. Prolonged bed rest weakens muscles, stiffens the spine and worsens outcomes. Staying as active as the pain allows, with proper pain relief to make that possible, gives better results. This advice is the opposite of what many patients are told.
It can — recurrence at the same level happens in a small proportion of patients, most often within the first year. The risk is higher in smokers and in those who return to heavy lifting too early. Most recurrences can be treated again, though repeat surgery is somewhat more difficult than the first.
Send the MRI and describe exactly where the pain travels — to the top of the foot, the sole, the outer calf. That path must match the level on the scan.
Your reports go directly to our medical team. We do not share your records with hospitals until you tell us to.
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