Discs are the cushions or shock absorbers located between each vertebra.
The outer layer of the disc is made of fibrocartilage laid down in many layers to give the disc strength. The inner portion of the disc is made of a gel-like substance, which is mostly water. All discs will experience wear and tear as we get older. The lumbar discs are located in the lower portion of the spine and absorb most of the weight of the body. The discs can be injured by trauma, frequent repetitive movements like bending and twisting and prolonged static postures like sitting in a car or at a desk.