Disc<unk>  can occur in any disc in the spine, but the two most common forms are lumbar disc<unk>  and cervical disc<unk> . The former is the most common, causing low back pain (lumbago) and often leg pain as well, in which case it is commonly referred to as sciatica. Lumbar disc<unk>  occurs 15 times more often than cervical (neck) disc<unk> , and it is one of the most common causes of low back pain. The cervical discs are affected 8% of the time and the upper-to-mid-back (thoracic) discs only 1–2% of the time. The following locations have no discs and are therefore exempt from the risk of disc<unk> : the upper two cervical intervertebral spaces, the sacrum, and the coccyx. Most disc<unk> s occur when a person is in their thirties or forties when the nucleus pulposus is still a gelatin-like substance. With age the nucleus pulposus changes ("dries out") and the risk of<unk>  is greatly reduced. After age 50 or 60, osteoarthritic degeneration (spondylosis) or spinal stenosis are more likely causes of low back pain or leg pain. * 4.8% of males and 2.5% of females older than 35 experience sciatica during their lifetime. * Of all individuals, 60% to 80% experience back pain during their lifetime. * In 14%, pain lasts more than two weeks. * Generally, males have a slightly higher incidence than females.
Spinal disc herniation
Piriformis syndrome
Spinal tumor
Lumbar disc disease
Spinal stenosis
Degenerative disc disease
Lumbar spinal stenosis
Cervical spinal stenosis