Sciatica: why your leg hurts when the problem is your back

One of the most confusing things about sciatica is that the pain is in your leg, but the problem is in your back. People often chase the leg, massaging the calf, stretching the hamstring, and wonder why nothing helps. Understanding where the pain really comes from is the first step to relief.

What sciatica actually is

“Sciatica” isn’t a diagnosis on its own, it’s a description of a symptom. It refers to pain that travels along the path of the sciatic nerve, the large nerve that runs from your lower back, through the buttock, and down the back of the leg.

When a nerve root in your lower spine is irritated or compressed, the pain shows up wherever that nerve travels. That’s why an issue in your back can produce a sharp, burning, or electric pain all the way down to your foot.

What it feels like

Sciatica has a distinctive character that sets it apart from ordinary muscle ache:

• Pain that radiates from the lower back or buttock down one leg.
• A sharp, burning, or electric quality, not a dull ache.
• Tingling, pins and needles, or numbness along the leg or into the foot.
• Sometimes weakness, the leg feels unreliable, or the foot catches.

It’s usually on one side. Coughing, sneezing, or sitting for a long time often makes it worse.

What’s pressing on the nerve

Several things can irritate a nerve root and produce sciatica. The most common is a herniated disc, where disc material presses on the nerve as it leaves the spine. In older adults, spinal stenosis, a narrowing of the space the nerves pass through, is a frequent cause. Less often, a slipped vertebra or simple inflammation is responsible.

Knowing the specific cause matters, because it shapes the treatment. This is why a proper assessment, history, examination, and imaging where appropriate, is worth more than guessing.

What actually helps

Here’s the good news: most sciatica improves without surgery. The nerve irritation tends to settle as inflammation reduces and, in the case of a herniation, as the disc fragment shrinks over time.

Most sciatica gets better on its own, the aim of treatment is to make that happen sooner, and more comfortably.

Staying gently active

The old advice to rest in bed has been overturned. Prolonged rest tends to make sciatica worse. Gentle, guided movement keeps the nerve mobile and the back strong. A physiotherapist can show you what’s safe.

Calming the nerve

Short courses of the right medication can take the edge off while you heal. When pain is stubborn, a targeted injection near the irritated nerve root can reduce inflammation and give you room to move again.

When to consider a procedure

If severe leg pain persists despite good non-surgical care, or if you develop progressive weakness, a small procedure to relieve the pressure on the nerve can be very effective. For a herniated disc, this is often a minimally invasive, same-day operation.

How long does sciatica last?

This is the question almost everyone asks, and the honest answer is: usually less time than it feels like in the moment. For many people, the sharp early phase settles over a few weeks, with a more gradual improvement over the following couple of months as the nerve calms and any disc pressure eases.

That said, sciatica doesn’t always run in a straight line. It’s common to have good days and bad days, and a flare after a busy day doesn’t mean you’ve undone your progress. What matters is the overall trend over weeks, not the reading on any single day.

A few things tend to help it settle faster:

• Keep moving within comfortable limits, motion is medicine for an irritated nerve.
• Change positions often. Long stretches of sitting are a common aggravator.
• Don’t panic at a flare. Setbacks are part of the normal pattern, not a sign of failure.

If your leg pain is stubbornly not improving after six weeks or so of sensible care, that’s a reasonable point to have it properly assessed, not because something is necessarily wrong, but because there may be more that can be done to help it along.

When to get seen promptly

Most sciatica is not an emergency. But a few symptoms need same-day medical care:

For everything else, the message is steady and reassuring: sciatica is usually temporary, it usually responds to the right care, and surgery is the exception, not the rule.