Whenever I moved my right leg a certainway my lower right side of my back hurts.?

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. The nerve then goes to the muscle which can then hurt, spasm or feel sore or irritated.