Back is often not what you expect. There is too much focus on disc herniations. Quite often the problem is a lack of blood supply to the spine. Atherosclerosis accumulates on the posterior wall of the abdominal aorta and plugs up the lumbar arteries that supply the spine. Multilevel disc degeneration develops. Degenerated discs lose their radial strength and disc herniations occur. Degenerated discs gradually lose their cushion function and bone spurs...