Sciatica: Symptoms, Causes and How Physiotherapy Treats It

Few pains rattle people like sciatica. Back pain is familiar, but pain that shoots down your leg, burns through your calf or makes your foot tingle feels like something is seriously wrong.

Here is the reassuring truth from the clinic floor: sciatica is common, usually self-limiting and very treatable. This guide walks through what is actually happening to the nerve, why it happened, the small set of warning signs that matter, and exactly how physiotherapy gets you moving again.

What sciatica actually is

The sciatic nerve is the largest nerve in your body, formed from nerve roots that exit the lower spine, merging into a cable roughly as thick as your thumb that runs deep through the buttock and down the back of the leg. Sciatica happens when one of those nerve roots gets irritated near its exit from the spine.

The nerve then does what irritated nerves do: it fires. You feel that firing along the nerve’s territory, which is why a problem sitting at your spine is felt in your hamstring, calf or foot.

Strictly speaking, sciatica is a symptom description, not a diagnosis. The clinical job is to find out what is irritating the nerve root and how badly, because that shapes the treatment plan and the timeline.

What it feels like: the classic symptom pattern

• Pain radiating below the knee, often sharp, burning or electric, usually down one leg. Pain that stops at the buttock or thigh can be referred from joints or muscles instead, which matters for treatment.
• Tingling or pins and needles in parts of the leg or foot, following the territory of the irritated root.
• Numb patches on the calf, foot or toes.
• Weakness in specific movements, like lifting the foot or rising onto the toes.
• Leg pain worse than back pain. Many people with sciatica have surprisingly little back pain. The leg is the loud one.
• Aggravation with sitting, bending or coughing, which raise pressure around the nerve root.

What causes the nerve irritation

The most common culprit is a lumbar disc herniation, where the soft centre of a disc pushes through its outer wall near the nerve root. The bulge presses on the root, and just as importantly, the disc material triggers local inflammation that chemically irritates the nerve.

This is why symptoms often improve as inflammation settles even when a scan still shows the bulge. Our herniated disc guide covers this in depth, including why most herniations shrink over time.

Other causes include narrowing of the nerve’s exit passages, called stenosis, more common after 60 and typically worse with standing and walking. Rarely, the nerve can be irritated further down its path, such as deep in the buttock.

Part of a physiotherapy assessment is distinguishing true nerve root pain from impostors: hamstring strains, buttock muscle trigger points and sacroiliac joint pain all masquerade as sciatica and need completely different treatment.

Red flags: the emergencies you must know

A small number of sciatica presentations need urgent medical care, not physiotherapy. Go to a hospital immediately if you notice any of the following.

• Numbness in the saddle area, the parts of you that would touch a bicycle seat.
• New difficulty controlling your bladder or bowels, either leakage or inability to go.
• Sciatica in both legs at once with worsening weakness.
• Rapidly progressing weakness, such as a foot that drops more each day.

The natural history: what happens if you do nothing

Here is the perspective most people are never given: the majority of disc-related sciatica improves substantially within 6 to 12 weeks, and research consistently shows that herniated disc material often shrinks and gets reabsorbed by the body over months. Your body actively cleans up the problem.

The catch is that "doing nothing" done badly, meaning weeks of bed rest, fear and total inactivity, produces worse outcomes than staying appropriately active. The nerve needs time, but the rest of you needs movement.

How physiotherapy treats sciatica, phase by phase

Phase 1: calm the nerve

Early treatment is about turning the volume down. That means finding your direction preference, the movements and positions that ease leg symptoms, and using them often.

For many disc-related cases, gentle repeated back extension eases leg pain, but this is genuinely individual, which is why cookie-cutter YouTube routines disappoint. It also means smart activity modification: shorter sitting spells, walking little and often, and positions of relief for sleep.

Manual therapy can help settle the guarded muscles around the spine and hip.

Phase 2: restore movement and nerve mobility

As the sharp leg pain recedes, treatment adds gentle nerve mobilisation, sometimes called nerve flossing, where the leg and spine move in sequences that slide the nerve through its passages without stretching it aggressively. Alongside this, hip and spine mobility work restores normal movement patterns that pain had switched off.

Phase 3: rebuild strength and resilience

The phase everyone skips, and the one that prevents round two. Progressive strengthening of the trunk, glutes and legs restores the capacity that protects the spine: bridges and hip hinges early, building towards loaded carries, squats and deadlift patterns appropriate to your life and sport.

If your goal is returning to the gym, our guide on back pain and lifting maps that journey.

What helps at home right now

• Keep walking. Short, frequent, flat walks are the safest early movement for most sciatica.
• Break up sitting. Sitting raises disc pressure and often aggravates the nerve. Stand or move every 20 to 30 minutes.
• Find your relief position. Many people get relief lying on their back with calves resting on a chair, or lying on the less painful side with a pillow between the knees.
• Use heat on the guarded muscles. A hot pack on the lower back or buttock can reduce the protective tension around the irritated area.
• Do not force aggressive stretches. Yanking your hamstring into a deep stretch pulls on an already irritated nerve. If a stretch shoots pain down the leg, that is a no.

Sitting, driving and office life with sciatica

Sciatica has terrible timing for desk workers. While the nerve is irritable, treat sitting like a dose: useful in small amounts, harmful in marathons.

Use a small lumbar roll or folded towel to support your lower back, keep the hips slightly higher than the knees, and stand for calls. For long drives around Ahmedabad traffic, set yourself up before you leave, adjust the seat more upright than usual, and plan a stretch stop on anything over 45 minutes.

These are temporary tactics for an irritable nerve, not lifetime rules.

Injections and surgery: where they fit

Most sciatica never needs either. Spinal injections can reduce inflammation around the nerve root and are sometimes used when severe pain blocks progress in rehabilitation.

Surgery, typically removing the piece of disc pressing on the nerve, is considered when there is significant progressive weakness, when red flag emergencies occur, or when substantial leg pain persists beyond weeks to months of proper conservative care. Studies comparing surgery with conservative treatment for standard cases tend to show surgery relieves leg pain faster, while longer-term outcomes often converge.

That decision belongs with you, your surgeon and your physio together, made on your specifics rather than fear.

How long does sciatica take to recover?

Honest answer: it varies, and anyone promising an exact date is guessing. Typical disc-related sciatica improves meaningfully within 6 to 12 weeks, with lingering minor symptoms sometimes taking longer to fully clear.

Recovery is rarely a straight line; expect good weeks with occasional flare days, and judge progress month to month rather than morning to morning. Cases with severe pain, marked weakness or long duration before treatment tend to need more time.

What consistently shortens the journey: early assessment, graded activity, and actually doing the strengthening phase.

Sciatica impostors: when it is not the nerve root at all

A meaningful share of "sciatica" that arrives in the clinic turns out to be something else wearing its jacket. Deep buttock muscle trigger points can refer aching down the back of the thigh.

A cranky sacroiliac joint produces one-sided buttock and thigh pain that people confidently label sciatica. Hamstring tendon irritation near the sitting bone hurts exactly where sitting hurts.

None of these involve the nerve root, none of them typically run below the knee with tingling or numbness, and all of them need different treatment than a disc-irritated nerve does. This is why the examination matters more than the label: stretch a true nerve root aggressively and you flare it, but the muscular impostors often love exactly that stretching.

Getting the diagnosis right in week one saves months of treating the wrong tissue.

The bottom line

Sciatica is an irritated nerve root, most often from a disc, and the odds are strongly in your favour: most cases settle without surgery. Screen the red flags, keep moving in tolerable doses, and get a proper assessment so your plan matches your cause.

At SattvaRig’s clinics in Ahmedabad we treat sciatica through this exact phased approach, and the free body scanner on our homepage is an easy first step if you are still figuring out what your symptoms mean.