Herniated Disc is a fragment of the spinal disc nucleus (spongy centre), which is pushed out of the annulus (outer ring), into the spinal canal through a tear or "rupture." In the herniated disc's new position, it presses on spinal nerves. This can cause pain, numbness, or weakness in the low back, leg or foot. Herniated discs are most common in the lumbar spine - the part of your backbone between the bottom of your ribs and your hips. They are often referred to as "slipped discs". However, the disc itself does not slip.