What is sciatica?
The sciatic nerve is the largest nerve in the human body, formed from nerve roots that exit the lower spine and travel through the buttock and down the back of each leg. 'Sciatica' is the umbrella term for the symptoms — typically sharp, burning, or shooting pain — that occur when one of those nerve roots is irritated or compressed. Identifying the cause is the key step: imaging plus a focused exam tells us whether the problem is a disc, stenosis, spondylolisthesis, or something else entirely.
Anatomy
Five nerve roots from the lumbar and sacral spine combine to form the sciatic nerve. Compression most commonly occurs at the L4-L5 or L5-S1 level, producing the classic pattern of pain shooting from the lower back through the buttock and down the leg. The specific pattern of symptoms helps localize which nerve root is affected.
Symptoms
- Sharp, burning, or shooting pain from the lower back through the buttock and down one leg
- Numbness or tingling in the buttock, leg, foot, or specific toes
- Weakness in the leg or foot, including foot drop
- Pain worsened by sitting, coughing, sneezing, or bending forward
- Difficulty walking or finding a comfortable position
Causes
- Lumbar herniated disc (most common)
- Lumbar spinal stenosis
- Spondylolisthesis
- Piriformis syndrome (a non-spinal cause)
- Less commonly, tumors or infections
Who is at risk?
- Age 30 to 50 for disc-related sciatica; older for stenosis-related sciatica
- Sedentary lifestyle or prolonged sitting
- Heavy lifting or repetitive twisting
- Smoking, obesity, and diabetes
Diagnosis
Diagnosis begins with a careful history and a neurologic examination — checking strength, sensation, reflexes, and provocative maneuvers like the straight-leg-raise test. MRI is the imaging study of choice and confirms the underlying cause in the great majority of cases.
When to see a spine surgeon
Most cases of sciatica improve within 6–12 weeks of conservative care. Seek urgent evaluation for severe or progressive weakness, foot drop, numbness in the groin or saddle area, or any change in bowel or bladder function — these can indicate cauda equina syndrome, a surgical emergency.
Non-surgical treatment
Treatment depends on the root cause. First-line care includes physical therapy, anti-inflammatories, brief activity modification, and image-guided selective nerve root or transforaminal epidural injections. The majority of patients recover with this approach.
Surgical options
Surgical relief for sciatica targets the underlying nerve compression directly. In most cases, I treat that with an endoscopic decompression — a small-incision procedure that relieves the pinched nerve, with many patients feeling immediate leg-pain relief on waking from surgery. When sciatica is driven by significant instability or severe arthritic changes, traditional teaching is to add a fusion — but in my endoscopic practice I can often still treat these patients endoscopically and avoid fusion altogether.
Related procedures
Endoscopic Microdiscectomy / Laminectomy
Biportal Endoscopic Spine Surgery (BESS) — among the least invasive ways to address disc herniations and spinal stenosis in the lumbar spine.
Endoscopic TLIF
A next-generation lumbar fusion that combines the structural goals of a traditional TLIF with the tissue-sparing advantages of endoscopic surgery.
This page is for general educational purposes and is not medical advice. Diagnosis and treatment recommendations require an in-person evaluation. To schedule a consultation with Erick R. Kazarian, MD, please book an appointment.
