A herniated disc, also called slipped disc or ruptured disc, is a condition caused from wear and tear of the cushioning discs present between the bones of the vertebral column. These discs act as shock absorbers while walking or running, and are made up of an outer tough layer (annulus) that surrounds a jelly-like center (nucleus). Disc herniation occurs when a part of the disc nucleus is pushed beyond the annulus through a rupture or tear. This displaced nucleus extends into the spinal canal, which passes through the entire vertebral column, and inflames and presses against the spinal nerves, causing pain.