Degenerative disc disease in the lumbar spine, or lower back, refers to a syndrome in which a compromised disc causes low back pain. The disc itself does not have a blood supply, so if it sustains an injury it cannot repair itself the way other tissues in the body can. An otherwise insignificant injury to the disc can start a degenerative cascade whereby the disc wears out. Despite its rather dramatic label, degenerative disc disease (DDD) is fairly common, and it is estimated that at least 30% of people aged 30-50 years old will have some degree of disc space degeneration, although not all will have pain or ever receive a formal diagnosis.