Pain Down the Back of the Leg: What Sciatica Actually Is

Sciatica describes pain that travels down the back of the leg along the path of the sciatic nerve, usually from irritation or compression of a nerve root in the lower back. It is a description of a symptom rather than a diagnosis, and the reassuring part is that the large majority of cases improve substantially within six to twelve weeks whatever is done.

The most common mistake is to treat it as a tight hamstring and stretch aggressively into it, which is roughly the opposite of what an irritated nerve wants.

How to tell it from a hamstring problem

The distinction changes what you should do, so it is worth a moment.

Nerve-related pain typically travels. It goes below the knee, often into the calf or foot. It can come with pins and needles, numbness or a burning quality. It may be worse sitting, and worse when you bend forward or cough. And crucially, it is often not proportional to the position: a small movement can produce a lot of symptom.

A hamstring problem stays in the hamstring, feels like a stretch or a strain, and is fairly proportional to how far you go.

If your symptoms go below the knee with any tingling or numbness, treat it as nerve-related and stop stretching it hard.

What tends to help

Keep moving. The old advice to rest is out of date and prolonged rest makes outcomes worse. Walking, within tolerance, is one of the most useful things available.

Find the direction that eases it. For a lot of people with disc-related irritation, gentle backward bending eases symptoms and sustained forward bending provokes them, but not for everyone, and some people are the reverse. The useful principle is centralisation: movements that pull the symptom back towards your spine and out of your leg are usually the helpful direction, even if they briefly increase the back pain.

Gentle nerve mobility, not stretching. Slow, small, repeated movements that take the nerve through a little range and back, rather than a long hold at the end of the range. Held stretching of an irritated nerve tends to make the next day worse.

Avoid the shapes that provoke it, temporarily. Deep seated forward folds, long sitting, and anything that produces symptoms further down the leg. This is a phase, not a permanent restriction.

Build back strength and hip strength once it settles. That is the part that matters for whether it returns, and it is the same argument as in back pain that keeps coming back.

The scans question

Most people with sciatica do not need a scan, and scans in this area are often unhelpful because disc bulges and degenerative changes are extremely common in people with no symptoms at all. A scan finding does not necessarily explain your pain, and being told you have the spine of a seventy-year-old at forty is a sentence that has done a great deal of harm.

Imaging matters when there are red flags, when symptoms are severe and persistent, or when surgery is being considered.

What needs a doctor now

Stop and seek urgent medical care for: numbness in the saddle area between the legs, difficulty passing urine or loss of bladder or bowel control, or numbness and weakness in both legs. These may indicate cauda equina syndrome, which is rare and an emergency.

Also see a doctor promptly for progressive weakness in the leg, such as a foot that drops or catches, and for pain following significant trauma, or with fever or unexplained weight loss.

Otherwise, worth seeing someone if it is not improving over six weeks, if it is severe, or if it keeps recurring.

What a session looks like in this phase

Short, frequent, gentle, and built around what eases your symptoms rather than around a standard sequence.

Walking. Gentle movement in the direction that helps. Careful hip and glute work. Breathing practice, which matters more than it sounds. Pain that has been present for weeks raises everyone's baseline tension, and that tension makes pain worse.

Then, as it settles over the following weeks, progressive loading. The end point is a stronger back and hips than you started with, not a more flexible hamstring.

Questions people ask

Should I stretch my hamstring if I have sciatica?

Generally no, not hard. If symptoms travel below the knee with tingling or numbness, the sciatic nerve is likely involved, and strong sustained stretching tends to aggravate it. Gentle repeated movement through a small range is better tolerated.

How long does sciatica last?

Most cases improve substantially within six to twelve weeks. Persistent or worsening symptoms beyond that warrant assessment.

Is it safe to do yoga with sciatica?

Yes, adapted. Avoid deep seated forward folds and anything that sends symptoms further down the leg, keep sessions short and frequent, and favour movements that ease the leg symptoms even if they are not the ones you expect.

When is sciatica an emergency?

Numbness in the saddle area, loss of bladder or bowel control, or weakness and numbness in both legs require immediate medical attention. Progressive weakness such as a dropping foot needs prompt assessment.