Sciatica Explained: Cause, Course and What Actually Helps

Sciatica is a symptom description rather than a diagnosis, and knowing what is usually behind it changes how alarming it feels.

What it is

Sciatica describes pain radiating along the path of the sciatic nerve, typically from the lower back or buttock down the back of the leg, sometimes to the foot. It often comes with numbness, tingling or weakness in the same distribution. The defining feature is that pain follows a nerve root distribution rather than being localised to the back. Pain that stays in the lower back without radiating is not sciatica, though the two often occur together.

Common causes

Lumbar disc herniation pressing on a nerve root is the most common cause, particularly in younger and middle-aged adults. Spinal stenosis, a narrowing of the spinal canal, is more common in older adults and typically produces symptoms worse on walking and relieved by sitting or leaning forward. Spondylolisthesis and, less commonly, piriformis syndrome can produce similar patterns. Most cases have a mechanical cause that improves.

Course and management

The natural history is generally favourable: a large majority of disc-related cases improve substantially within six to twelve weeks without surgery. Staying active within tolerance is better supported than bed rest, which worsens outcomes. Simple analgesia, guided physiotherapy and time form the mainstay. Red flags requiring urgent assessment include bladder or bowel dysfunction, saddle numbness, or progressive bilateral leg weakness, which can indicate cauda equina syndrome - a surgical emergency.

NeuronGold in context

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