How long does sciatica last?

What sciatica is

Sciatica is not a diagnosis in itself but a description: pain that travels from the lower back or buttock down the back of the leg, often with pins and needles, numbness or weakness, because the sciatic nerve or one of the nerve roots that form it is irritated. The most common cause is a lumbar disc herniation, where part of a disc presses on or inflames a nerve root. Less often it relates to spinal stenosis, a tight piriformis muscle in the buttock, or other causes your clinician will check for.

The typical course

The reassuring news is that most episodes of sciatica improve on their own. Research suggests that a large proportion of people feel substantially better within four to six weeks, and most within around three months, even without specific treatment. Disc herniations tend to shrink over time as the body reabsorbs the displaced material, and the inflammation around the nerve settles.

That said, recovery is rarely a straight line. Pain often eases first in the foot and calf and lingers in the buttock or thigh for longer, and numbness can take months to fade after the pain has gone. A minority of people have symptoms that persist beyond three months or come back repeatedly; for them a more structured plan, and sometimes a medical opinion, is worthwhile. Outcomes vary from person to person, and nobody can promise a timeline.

What may help it settle

• Keep moving within tolerance. Bed rest beyond a day or two tends to slow recovery. Short, frequent walks and gentle changes of position are generally better than long periods sitting or lying still.
• Find the positions that ease the leg pain. Many people find lying on their side with a pillow between the knees, or on their back with the knees supported, more comfortable. Your physiotherapist can show you movements that may reduce leg symptoms.
• Pace activity rather than pushing through. Flare-ups after doing too much are common; the aim is to build up gradually.
• Pain relief. Over-the-counter options may help you stay active; ask your GP or pharmacist what is suitable for you.
• Physiotherapy or chiropractic care. An assessment confirms the likely cause, rules out other problems and gives you a plan: graded exercise, advice on sitting, lifting and sleeping, and hands-on treatment where appropriate. Evidence suggests that structured exercise and advice may improve recovery for some people, although the effect varies.
• Sleep, stress and general health all influence how sensitive the nerve is and how quickly it calms down.

What tends to slow recovery

Long periods of sitting, heavy lifting or bending early on, fear of movement, poor sleep and high stress are all associated with slower recovery. Smoking and some medical conditions can also affect how well nerves heal. If sciatica is stopping you working, exercising or sleeping for more than a few weeks, it is worth getting assessed rather than waiting it out alone.

When imaging is considered

Most sciatica does not need a scan: the diagnosis is made from your history and examination, and an MRI early on rarely changes the plan. Imaging becomes useful when symptoms are severe or progressive, when weakness is developing, when symptoms have not improved after six to twelve weeks of appropriate care, or when a surgical or injection opinion is being considered. Where a scan would change what we do, our clinicians can arrange fast-track MRI through our imaging partner and go through the report with you.

Warning signs: do not wait

Rarely, pressure on the nerves at the bottom of the spine affects bladder, bowel or sexual function. This is called cauda equina syndrome and it is an emergency. Go to A&E immediately, or call 999, if you have sciatica together with any of the following:

• difficulty starting to pass urine, loss of the feeling of needing to go, or loss of bladder control
• loss of bowel control, or loss of the feeling of needing to open your bowels
• numbness or altered sensation around the genitals, back passage or inner thighs (the "saddle" area)
• new or worsening weakness in both legs, or difficulty walking
• sudden loss of sexual sensation or function

Separately, call us for a same-day assessment if your leg pain followed a fall or accident, is severe and getting worse despite rest, comes with fever or unexplained weight loss, or you have a history of cancer or osteoporosis. We can examine you and arrange imaging if needed. For more severe symptoms, such as a suspected fracture or pain so severe that it cannot wait, go straight to A&E.

When to book

If sciatica is affecting your sleep, work or exercise, has lasted more than two to three weeks, or keeps coming back, an initial assessment with one of our physiotherapists or our chiropractor is a sensible step. You do not need a GP referral to book privately. We will confirm the likely cause, give you a plan and tell you honestly what to expect. Our clinic is in Bloomsbury, a few minutes from Russell Square and Holborn, and fees are on the fees page.