Sciatica: why the pain runs down the leg

Few kinds of pain are as frightening as the one that starts in the lower back and travels down the leg, burning or tingling. This is classic sciatica — and the first important thing to understand is that it is not a disease in itself, but a symptom that something is irritating the sciatic nerve.

What the sciatic nerve is

The sciatic nerve is the largest nerve in the body. It leaves the lower back, passes through the buttock and runs down the entire leg. When a root that forms this nerve is compressed or inflamed — most often by a herniated disc — the pain can be felt along its whole path, not just in the back.

That is why sciatica usually comes with:

• Pain radiating from the lower back or buttock into the leg
• Tingling or a burning sensation
• Weakness or heaviness in the affected leg

Why most people improve without surgery

The most common cause of sciatica is a herniated disc — and, as with most herniations, the body tends to reabsorb part of the lesion and reduce the inflammation over time. Treatment serves to control the pain and speed up this recovery:

1. Pain and inflammation control in the acute phase
2. Specialized physical therapy as soon as possible
3. Movement retraining to protect the spine

Prolonged strict bed rest usually gets in the way rather than helping. The right movement, at the right time, is part of the treatment.

When to investigate further

Not all leg pain is sciatica, and not all sciatica is the same. It is worth seeing a specialist when the pain is severe and persistent, when there is progressive loss of strength or when more serious neurological signs appear. In these cases, imaging read together with your history defines the best course of action — which only rarely needs to be surgical.

If leg pain is taking away your quality of life, the way forward is to understand its source before treating it blindly.