Spine

Sciatica — Why Your Leg Pain Starts in Your Back

साइटिका — आपके पैर का दर्द आपकी पीठ से क्यों शुरू होता है

సయాటికా — మీ కాలి నొప్పి మీ వెన్నెముక నుండి ఎందుకు మొదలవుతుంది

Sciatica isn't a diagnosis in itself — it's a symptom of an irritated or compressed sciatic nerve, the longest nerve in your body, running from your lower back through your buttock and down each leg. The most common cause is a herniated or slipped disc in the lower spine pressing on a nerve root. The good news: the vast majority of sciatica settles down on its own with the right conservative care, and surgery is rarely the first step.

🕐 7 min read
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Dr. Sumit Dubewar

MBBS · DNB · DABRM (USA) · FIJR · FIASM · MNAMS
Orthopedic & Regenerative Specialist · Secunderabad · +91 9370498182

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What Causes Sciatica?

Understanding sciatic nerve compression

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Sciatica happens when the sciatic nerve — which runs from your lower back, through your buttock, and down the back of each leg — becomes irritated or compressed at its root in the spine. The pain you feel in your leg is actually coming from a problem in your lower back. Several conditions can cause this compression:

  • A herniated or slipped disc in the lower spine (the most common cause) — the soft inner material of a disc pushes out and presses on a nearby nerve root
  • Spinal stenosis — a narrowing of the spinal canal that puts pressure on the nerve roots, more common with age-related wear and tear
  • Piriformis syndrome — spasm or tightness in the piriformis muscle deep in the buttock, which can irritate the sciatic nerve as it passes beneath or through it
  • Spondylolisthesis — one vertebra slipping forward over the one below it, narrowing the space where the nerve exits
  • Degenerative disc disease and bone spurs that develop with age and gradually narrow the space around the nerve roots
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Symptoms of Sciatica

How sciatic nerve pain typically presents

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  • Sharp, burning, or shooting pain that travels from the lower back or buttock down the back of one leg — sciatica is almost always one-sided
  • Numbness or tingling ("pins and needles") along the path of the nerve, from the buttock down to the calf or foot
  • Pain that worsens with prolonged sitting, standing up from a seated position, bending forward, coughing, or sneezing
  • A dull ache in the lower back that may be less noticeable than the leg pain itself
  • Weakness in the leg or foot, or difficulty lifting the front of the foot while walking, in more severe cases

Seek emergency care immediately if you experience loss of bladder or bowel control, numbness in the groin or inner thighs (saddle numbness), or progressive weakness in one or both legs. These can be signs of cauda equina syndrome, a rare but serious emergency that requires urgent evaluation and often urgent surgery to prevent permanent nerve damage.

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How Sciatica Is Diagnosed

Clinical exam first, imaging when needed

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In most cases, sciatica can be diagnosed through a careful history and physical examination, without needing any scans at all.

Physical Examination

  • Straight-leg-raise test — with you lying flat, the doctor slowly raises your leg; pain reproduced below the knee at a certain angle strongly suggests nerve root irritation
  • Neurological examination — checking reflexes, muscle strength, and sensation in the leg and foot to see which nerve root is affected and how severely
  • Assessment of your gait, spine posture, and range of motion

Imaging

  • X-rays may be used to rule out other causes such as fractures or alignment problems, though they don't show discs or nerves directly
  • MRI is the imaging test of choice — it clearly shows the disc, nerve roots, and spinal canal. It's reserved for cases where pain is severe, persists beyond 4-6 weeks despite treatment, or when red-flag symptoms are present
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Treatment Options for Sciatica

Most cases heal without surgery

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The great majority of sciatica cases — well over 90% — resolve on their own within 6 to 12 weeks with the right conservative approach. Treatment is stepped, starting with the simplest, least invasive options.

Conservative Care (First Line)

  • Activity modification — staying reasonably active rather than strict bed rest, which can actually slow recovery
  • Physiotherapy — targeted exercises to relieve nerve pressure, improve core and spine support, and restore movement
  • Anti-inflammatory and pain-relief medication to manage symptoms while the underlying irritation settles
  • Short-term use of heat or ice for comfort

Injections

  • Epidural steroid injections may be considered for severe pain that hasn't responded to a few weeks of initial conservative treatment — they can reduce inflammation around the nerve root and provide a window for physiotherapy to work

Surgical Options

  • Discectomy (removing the portion of disc pressing on the nerve) is reserved for a smaller group of patients: those with significant or progressive leg weakness, those who haven't improved despite 6-12 weeks of proper conservative care, or emergency cases such as cauda equina syndrome

Key takeaway: Surgery is not the default treatment for sciatica. For most patients, the right conservative plan — not strict rest, but guided activity and physiotherapy — resolves the pain within weeks.

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Exercises for Sciatica

Movement helps recovery

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Gentle, guided movement is one of the most effective tools in sciatica recovery — it keeps the spine mobile, eases pressure on the nerve, and prevents the stiffness and deconditioning that prolonged rest can cause. A structured, progressive routine works far better than either staying still or pushing through sharp pain.

View Exercises →
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Dr. Sumit's Advice

A clinician's perspective on sciatica

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One of the most common misconceptions I see in my clinic is that sciatica automatically means surgery is coming. In reality, the nerve pain that brings most patients to me — however sharp and frightening it feels — settles down with time and the right conservative approach in the overwhelming majority of cases. My job in those first weeks isn't to rush toward an operating table; it's to get the diagnosis right, rule out the rare emergencies that do need urgent attention, and guide activity and physiotherapy so the nerve has the best chance to heal on its own. Surgery has its place, and when it's genuinely needed — significant weakness, or pain that simply isn't responding after a fair trial of conservative care — I don't hesitate to recommend it. But it should never be the first conversation we have.

— Dr. Sumit Dubewar · DABRM (USA) · Secunderabad

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