A disc herniation occurs when the jelly-like center of the intervertebral disc spills into the canal. This occurs when the fibrous outer layer (annulus) which surrounds the jelly-like center (nucleus) tears or breaks. Herniations can spill into various parts of the spinal canal and may cause pain, numbness, or weakness.
Also known as: herniated disc, disc extrusion
![Disc Herniation or Bulge](https://www.spineinfo.com/wp-content/uploads/2022/11/disc-bulge-and-herniation-1024x507.jpg.webp)