Age
As we age, our body goes through changes, and so do our discs. The discs in our spine gradually age along with us, becoming drier and losing some of their cushioning ability compared to when we were younger. This natural aging process causes the discs to become thinner and harder over time. Additionally, the facet joints, which connect one vertebra to the next, also experience wear and tear as we age, leading to breakdown of the cartilage surfaces.
Bone Growth and Spondylosis
When bones rub against each other, it can trigger bone growth in the form of spurs or projections. This response is known as spondylosis. As a result of the loss of rubbery tissues and the formation of spurs, the spine becomes stiffer. Consequently, the movement of the back becomes less smooth and there is increased friction between the bones of the spine.