A herniated or slipped disc is a problem that happens when one of the rubbery cushions (discs) between the bones in your spine moves out of place. These discs have a soft, jelly-like center called the nucleus, surrounded by a tougher outer layer called the annulus. Sometimes, certain movements or too much strain on the lower back can cause a disc to slip. When this happens, part of the jelly-like center can push through a tear in the outer layer, which can irritate nearby nerves. This can happen anywhere along the spine and may lead to pain, numbness, or weakness.