Disc problems

Discs are the softer, cartilagenous parts between the bones that make up your spine. They are normally elastic, so that you can move your back easily. Size and shape of discs change when you sleep, and as you move during the day.

The aging process can make discs wear out. So can poor posture. Any time discs begin to wear out, the bones of your spine may press too closely together and cause pain, by irritating nerves in the outer (annulus) portion of discs.

A torn annulus is a small tear in the outer portion of a disc which causes pain. If a disc is wearing out, sometimes the softer center (nucleus) of the disc presses its way through the outer portion of the disc, causing a bulge. Another problem is a herniated or ruptured disc. If a disc has been bulging, a sudden movement may cause the outer portion to rupture (tear) and the central nucleus to herniate.

Arthritis

Arthritis may be caused by a combination of worn-out discs, bony outgrowths called spurs, and a process called stenosis -- a narrowing of the space around the spinal cord and nerves.

Sciatica

Some of the nerves that run through your spine also run down into your legs. If you have a damaged disc pressing on one of these nerves in your spine, it may send shooting pain into your leg.