Sciatica is not a disease in itself but a symptom: pain that radiates from the lower back into the leg, caused by irritation of a spinal nerve root — most often by a disc herniation. The good news is that most cases settle within a few weeks, without surgery. This article helps you find your way: what causes it, when conservative treatment is enough, when it is urgent, and when surgery comes into play at all.
“Sciatica” is an everyday word for what a doctor calls lumbar radicular pain: pain running from the lower back, through the buttock, down the back or outer side of the leg. Behind it lies irritation of, or pressure on, the root of a lumbar (lower-back) spinal nerve — so the pain is not produced by the muscle or the joint itself, but “relayed” toward the leg by a nerve. It is often accompanied by numbness, tingling or weakness along the same line.
An important starting point: sciatica is a symptom, not a diagnosis. On its own it only tells you that a nerve root is involved — not what is causing it. That is why the first step in treatment is always to clarify the cause.
The most common cause is a lumbar disc herniation: the protruding disc material presses on or irritates the adjacent nerve root (typically at the L4–L5 or L5–S1 level). Other common causes are spinal stenosis — when the space available for the nerves narrows — and spondylolisthesis (a slipped vertebra).
“Piriformis syndrome” is also often mentioned: the idea that a buttock muscle is pressing on the nerve. This explanation is firmly established in popular belief, yet the medical literature still regards it as controversial, and there is no convincing proof of its existence. For that reason it is worth investigating the complaint thoroughly, starting from the lumbar spine — rather than closing the case with a popular but uncertain label. You can read more about the treatment of disc herniation.
In most cases, yes — and this is one of the most important, yet least known, features of sciatica. Acute sciatica typically improves substantially within a few weeks, on its own or with targeted conservative treatment.
Surgical studies confirm this, in a perhaps surprising way: even among patients whose symptoms had already lasted 6–12 weeks — that is, the more stubborn cases enrolled in surgical trials — roughly half eventually settled without surgery, with continued conservative care.
Even so, it is worth being honest: in a minority, the complaint persists or returns from time to time — regardless of treatment. This is not a failure, but part of the natural course of sciatica; here the aim is a lasting improvement in pain and function. And one important note about scans: the measure of recovery is how you feel, not what a further image shows — you can read more in the article on reading your MRI report.
The vast majority of sciatica is not an emergency. There are, however, a few symptoms that should not wait, because they may signal accelerating damage to a nerve:
These can be signs of cauda equina syndrome, where time matters: surgery may be needed within hours to prevent lasting nerve damage. In that case, do not wait for your next appointment — seek emergency care. For a full guide on when back pain and radiating leg pain are urgent, see our dedicated article.
Since most sciatica settles without surgery, the first line of treatment is almost always conservative. Its elements are:
The aim is to relieve the pain and restore function while the body itself resolves the complaint. You can also read in detail about the tools of conservative treatment.
In the treatment of sciatica, surgery is not the first step but the last — and it becomes necessary only in a minority of cases. It typically comes up:
One important and often misunderstood point about the role of surgery: surgery (typically microdiscectomy) generally provides faster pain relief than waiting — but the long-term outcome evens out between the two paths within about a year, and there is no meaningful difference even years later. Surgery therefore mainly buys time, not necessarily a “better end.” This helps you weigh things realistically: with urgent, unbearable symptoms, faster relief can matter a great deal, while the patient, conservative route leads to the same place in most cases. You can read about the surgical techniques on the disc herniation and stabilization surgery pages.
A few simple principles help with the right decision:
A good decision never comes from the scan alone, but from your symptoms, the physical examination and the scan together. This guide does not replace a medical examination — when in doubt, seek medical help, and immediately if you have urgent symptoms.
Is sciatica the same as a disc herniation?
No. Sciatica is the symptom — the radiating, nerve-root pain in the leg. A disc herniation is its most common cause, but not the only one: spinal stenosis or a slipped vertebra can also cause it.
How long does sciatica last?
Most acute sciatica improves substantially within a few weeks. In a minority it can drag on or return; if it does not improve after 6 weeks of appropriate treatment, investigation is recommended.
Can I move with sciatica, or do I need to rest?
Bed rest is not necessary and does not speed recovery. It is better to keep up your usual movement up to the limit of the pain — prolonged lying down tends to hold you back.
Is sciatica dangerous?
In the vast majority of cases, no. A few symptoms, however — difficulty with bladder or bowel control, numbness in the saddle area, rapidly worsening leg weakness — require immediate care.
Do I need an MRI for sciatica?
Not always. The diagnosis rests primarily on your symptoms and the physical examination; an MRI is warranted if the complaint persists, worsens, or if an urgent sign appears.
If the complaint will not settle, or you are unsure of the next step — bring your scans and reports, we will go through them together, and I will give you a clear picture of your options.
This article draws on the following professional sources: