Sciatica refers to pain that radiates along the path of the sciatic nerve, which extends from the lower back down the back of each leg. The pain typically travels from the lower back through the buttock and into the leg, and it can vary in intensity from mild to severe. Sciatica is not a condition itself but rather a symptom of an underlying problem, such as a herniated disc, spinal stenosis, or degenerative disc disease, that compresses or irritates the sciatic nerve. Pain that radiates from the lower back down the buttock and leg, often described as sharp, shooting, or burning in nature.