Sciatica vs. Back Pain: How to Tell the Difference
Dr. Soutrik Mukherjee
MS (Ortho) · AO Masters · Advanced Ortho and Spine Clinic, Kolkata
Back pain and sciatica are often confused — and sometimes they occur together — but they are fundamentally different problems with different causes and treatments. Getting the distinction right matters enormously for choosing the correct treatment.
What is mechanical back pain?
Mechanical back pain originates from the muscles, ligaments, facet joints, or discs of the lower back — without nerve involvement. It is typically felt as a dull ache in the lower back, worsened by certain movements (bending, lifting, prolonged sitting), and relieved by rest or position changes. It does not travel down the leg below the knee, and there is no numbness, tingling, or weakness in the legs. This is the most common type of back pain and the majority of cases resolve with physiotherapy, core strengthening, and activity modification.
What is sciatica?
Sciatica is pain caused by compression or irritation of the sciatic nerve — the longest nerve in the body, running from the lower spine down through the buttock and leg to the foot. True sciatica causes pain that radiates from the lower back or buttock down the back of the leg, often reaching below the knee and into the foot. It is frequently accompanied by tingling, numbness, or a burning sensation. In severe cases, there may be weakness in the foot or leg. The most common cause is a lumbar disc herniation compressing a nerve root.
Key differences to look for
The most useful distinguishing feature is whether the pain travels below the knee. Pure mechanical back pain rarely does. If you have shooting, burning, or electric pain down one leg reaching the calf, ankle, or foot — particularly with numbness or tingling — that is sciatica until proven otherwise. Sciatica is also typically worse with sitting and coughing, and may be relieved by walking.
When does sciatica need surgery?
The vast majority of sciatica — around 80–90% — resolves with conservative management over 6–12 weeks: physiotherapy, anti-inflammatory medication, nerve pain medications, and sometimes an epidural steroid injection. Surgery (typically a microdiscectomy) is indicated when pain is severe and unresponsive to 6 weeks of treatment, when there is significant motor weakness, or in the rare emergency of cauda equina syndrome (loss of bladder/bowel control).
In Summary
If you have pain radiating down your leg, particularly with numbness or weakness, please do not self-treat with only painkillers. Get a proper clinical examination and, if indicated, an MRI. The right diagnosis leads to the right treatment — and in most cases, that treatment is not surgery.
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