Sciatica: Causes, Treatment and When Surgery Is Actually Needed
What sciatica is, why most cases settle within six to twelve weeks, the treatments with evidence, the emergency signs, and when spine surgery is actually advised.
Key takeaways
- Sciatica is pain travelling down the back of the leg, usually below the knee, most often from a disc pressing on a nerve root in the lower back.
- Most sciatica improves within six to twelve weeks without surgery, and many disc herniations shrink on their own.
- Stay as active as you can. Bed rest slows recovery. Physiotherapy, short-term pain relief and, for severe cases, an epidural injection are the main tools.
- Surgery is for cauda equina syndrome, progressive weakness such as foot drop, or severe leg pain that has not settled. It brings faster relief, but long-term results are often similar.
Sciatica is one of the commonest reasons Indians end up with a spine MRI and, too often, a recommendation for surgery made on the basis of that MRI alone. The good news is that most sciatica gets better on its own. The useful question is not whether the MRI shows a disc problem, which it usually does, but whether your symptoms fit one of the specific situations where surgery helps. This guide explains them.
Quick answer
Sciatica is leg pain, usually below the knee, from a nerve root squeezed in the lower back, most often by a disc. Most cases improve within six to twelve weeks with activity, physiotherapy and short-term pain relief. Surgery is for bladder or bowel changes and saddle numbness (an emergency), worsening weakness such as foot drop, or severe pain that has not settled after good non-surgical care.
What sciatica is
The sciatic nerve is formed from nerve roots that leave the lower spine. When one of these roots, usually L5 or S1, is pressed or inflamed, often by a herniated disc at L4-L5 or L5-S1, pain travels along its path into the buttock and down the back or side of the leg, sometimes to the foot, with tingling or numbness. Leg pain worse than back pain is the hallmark. The disc bulge vs herniation guide explains the MRI findings.
What usually happens
Most people improve within six to twelve weeks. Herniated disc material, especially larger fragments, is often reabsorbed by the body over time. This natural course is why guidelines recommend a period of good non-surgical care before considering an operation, unless one of the red flags below is present.
Treatments with evidence
| Treatment | Role |
|---|---|
| Staying active, gentle walking | First line; bed rest slows recovery |
| Short-term pain relief (anti-inflammatories, paracetamol as advised) | Helps you stay active |
| Physiotherapy and graded exercise | Core of recovery; improves strength and movement |
| Epidural steroid injection | For acute, severe sciatica; can ease pain for weeks |
| Microdiscectomy surgery | For specific indications below |
Guidelines advise against relying on long courses of opioids or nerve-pain medicines such as gabapentin and pregabalin for sciatica, since the benefit is small and side effects are common. Traction, prolonged bed rest and many belts and devices sold for sciatica have little evidence.
Go to an emergency department the same day if you have
New difficulty passing urine or controlling bladder or bowel, numbness around the genitals, inner thighs or back passage, sexual dysfunction of sudden onset, or rapidly worsening weakness in one or both legs. These can signal cauda equina syndrome, which needs urgent surgery.
When surgery is recommended
Urgently: cauda equina syndrome, or rapidly progressive weakness such as a foot that starts to drop and catch while walking.
As an option: severe leg pain that has not improved after six to twelve weeks of good non-surgical care, with an MRI showing a herniation at the level and side that matches the symptoms and examination.
In a large Dutch trial published in the New England Journal of Medicine, early surgery gave faster relief of leg pain over the first months, but at one year most people in both groups had recovered similarly. So surgery buys speed, not necessarily a better final result, and the choice depends on how severe and disabling the pain is.
Questions to ask before agreeing to surgery
Does the MRI finding match my leg symptoms and examination? Is there weakness, and is it getting worse? What happens if I wait another few weeks? What exactly will the operation do, and what is the recovery? A good spine surgeon, neurosurgeon or orthopaedic, welcomes these questions.
When to see a doctor
See a doctor if leg pain is severe, if you have numbness or weakness, if pain is not improving after a few weeks, or if you have a history of cancer, fever, weight loss or a recent fall or injury with back pain. Tingling in the hands rather than the legs has different causes; see the tingling and numbness guide.
Frequently asked questions
How long does sciatica take to heal?
Most people improve substantially within six to twelve weeks, and many within a few weeks. Some have lingering numbness or occasional flare-ups for months. Pain that is worsening, or weakness that is increasing, needs earlier review.
Should I rest in bed with sciatica?
No. Short rests are fine when pain is severe, but prolonged bed rest weakens muscles and slows recovery. Gentle walking and staying as active as pain allows is the advice from guidelines.
When is surgery needed for sciatica?
Surgery is urgent for cauda equina syndrome, with bladder or bowel changes or numbness in the saddle area, and for rapidly worsening leg weakness. It is considered for severe leg pain that has not improved after several weeks of good non-surgical care, when an MRI shows a herniation that matches the symptoms. The usual operation is a microdiscectomy.
Is surgery better than waiting for sciatica?
In a well-known trial, people who had early surgery recovered faster over the first few months than those who waited, but by one to two years the outcomes were similar. That makes surgery a reasonable choice for severe, persistent pain, not an automatic one.
Who treats sciatica, a neurosurgeon or an orthopaedic surgeon?
Both. Most sciatica is managed first by a general physician, physiotherapist or pain specialist. When surgery is considered, both neurosurgeons and orthopaedic spine surgeons perform it; experience with spine surgery matters more than which department the surgeon belongs to.
Sources
Dr. Garima Panse is a medical doctor who writes plain-language guides for Indian readers on skin health, heart health, brain and nerves, medical imaging and everyday medicine. Every guide lists its sources, shows the date it was last reviewed, and says when to see a doctor in person.
This guide is for general education and reflects the evidence available on the last reviewed date. It is not a diagnosis, a prescription or a substitute for seeing a doctor who can examine you. If you have symptoms that worry you, or the guide tells you to see someone, please do. Full disclaimer.