Final answer:
Degenerative disc disease can be worsened by lifting objects incorrectly, which damages discs and vertebrae, along with the increased spinal curvature seen in obese individuals or during pregnancy, leading to higher shearing forces on the discs.
Step-by-step explanation:
Several factors can exacerbate the condition of degenerative disc disease. First, the weakening of the anulus fibrosus, a component of the intervertebral disc, can lead to a herniated disc. This condition allows the inner nucleus pulposus to protrude outward, sometimes pressing against a spinal nerve, which may result in pain and muscle weakness in the affected nerve's supply area.
Improper lifting techniques, such as lifting with the back rather than the legs, are a common cause of increased stress on the spine. These actions produce abnormally large forces on the back muscles and spine, potentially causing muscle strain and damaging the intervertebral discs. Additionally, an increase in the normal curvature of the spinal column due to obesity or pregnancy can create higher shearing forces on the spine, especially affecting the lumbosacral disc, and potentially leading to ruptured discs.