What is degentive disc?

Back pain. Degenerative disk disease is a breakdown of the spongy disks that separate the bone disks that make up your spine. Basically think of them as jelly donuts. Over time the 'jelly' and starts to bulge and can put pressure on the nerve roots as they exit the spinal column. This pain can be positional due bending forward/backward/sideways which can cause the bulge to change.
Common cause of pain. Degenerative disc disease is a common problem people develop over time. What happens is that the discs in our neck and back start to lose their elasticity and they tend to decrease in size. When this happens, that is how we start to lose shrink over time. Discs are normally more pliable, with degeneration they are more firm and they dry up.