How do a sciatica and herniated disc differ?

Symptom Vs Cause. Sciatica is the symptom of leg pain caused by a disc herniation or narrowing where the nerve exits the spine. A disc herniation is a outpouching of the disc from its normal place into the spinal canal or on the nerve and can be a source of pain in the back or down the leg, .
Sciatica. Sciatica is the clinical term for the pain that radiates down the leg. A herniated disc is a common cause of sciatica and this an anatomical situation where the disc in the spine has herniated from its normal anatomical position and causes compression of a nerve root and in turn leads to sciatica.