Sciatica is sharp, shooting pain that travels from the lower back through the buttock and down one leg — sometimes all the way to the foot. It's not a diagnosis on its own; it's a symptom indicating that one of the nerve roots leaving the lumbar spine is being irritated or compressed.
About 40% of adults experience sciatica at some point in their lifetime. The good news: 70-80% of cases resolve within 6-12 weeks with conservative care. But the wrong cases — those with neurological warning signs — need urgent attention.
What's actually happening
The sciatic nerve is the largest nerve in the body — formed from nerve roots L4 through S3, running from the lower spine through the buttock and down the back of the leg. When a lumbar disc herniates, a bone spur develops, or the spinal canal narrows (stenosis), one of these nerve roots gets compressed. The result: pain following the path of that specific nerve.
The 4 most common causes
1. Lumbar disc herniation — the most common cause in patients under 50.
2. Lumbar spinal stenosis — narrowing of the spinal canal, more common over 60.
3. Spondylolisthesis — one vertebra slipping forward over another.
4. Piriformis syndrome — the piriformis muscle in the buttock irritating the sciatic nerve. Less common but distinct treatment.
Typical conservative treatment timeline
Week 1-2: pain control with anti-inflammatories, activity modification, ice for acute spasms. Avoid prolonged sitting and heavy lifting.
Week 2-4: physical therapy begins. Targeted exercises (McKenzie extensions, neural mobilization) often reduce nerve root irritation. Pain decreases noticeably.
Week 4-8: pain continues to subside. Strengthening phase. Most patients return to most activities.
Week 8-12: 70-80% of patients are largely pain-free. The remaining 20-30% may need an epidural injection or — rarely — surgical consultation.
Red flag symptoms — see a doctor urgently
Cauda equina syndrome (true emergency, surgery within 24-48 hours): loss of bladder or bowel control, numbness in the saddle area (groin/inner thighs), severe weakness in both legs.
Other urgent flags: progressive weakness (foot drop, can't lift the toes), severe numbness affecting daily function, severe pain unresponsive to medication, sciatica after significant trauma, or sciatica combined with fever, weight loss, or history of cancer.
When surgery is the right call
Surgery is the right answer when: cauda equina syndrome is present (immediate surgery); progressive neurological deficit (urgent surgery); pain that persists more than 8-12 weeks despite optimal conservative care; or severe pain unresponsive to all conservative measures including epidural injection.
Modern microdiscectomy is the most common operation — a 2-3 cm incision, minimally invasive, often a day case. Most patients report dramatic leg pain relief within hours of surgery.
Sciatica is almost always treatable. The mistake patients make is enduring it for years instead of getting a proper assessment. Early diagnosis means more options — including conservative ones. Late diagnosis often means the only option left is surgery. — Prof. Dr. Ahmed Shawky, Bone Art Clinic
Frequently Asked Questions
How long does sciatica last?
Most cases improve significantly within 4-6 weeks of conservative treatment and resolve within 6-12 weeks. Cases that persist beyond 12 weeks need imaging and specialist assessment.
Can sciatica cause permanent nerve damage?
Rare with prompt treatment, but possible if severe nerve compression is untreated for months. Progressive weakness, foot drop, or loss of bladder/bowel control are signs that surgery may be needed urgently to prevent permanent damage.
Should I rest or stay active with sciatica?
Stay gently active. Bed rest beyond 1-2 days worsens outcomes. Walking 15-30 minutes daily, avoiding aggravating positions, and following a physical therapy program produces faster recovery than rest.
When do I need an MRI for sciatica?
MRI is ordered when pain persists beyond 6 weeks of treatment, when there are neurological warning signs (weakness, numbness, bowel/bladder symptoms), or when surgery is being considered. Most acute cases don't need MRI initially.
Are epidural injections safe for sciatica?
Yes, when performed by an experienced specialist under imaging guidance. Limited to 2-3 per year. Most patients tolerate well. About 60-70% experience significant pain relief lasting weeks to months — long enough for natural healing to progress.