Symptom Vs Cause. A disc herniation causes sciatica, which is a symptom of back & 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, .
Rupture. The disc is that structure that is placed between each vertebra. It acts as a cushion that help absorb shocks from the axial loading of the spine. A herniation indicates that the annular or outer fibers of the disc cannot no longer contain the soft nucleus pulposus. It is like a hole in a tube of tooth paste that develope a hole. The paste begin to push out thru the hole onto the nerve.