It can protrude in any direction, but protruding forward (that is, protruding to the abdomen) will not compress the nerve or spinal dural sac and will not produce symptoms. Protruding backward (backward) will compress nerve roots and spinal dural sac, resulting in symptoms of low back and leg pain. Another is that the nucleus pulposus protrudes upward and downward. No matter what kind of protrusion, there will be local pain symptoms at first. When the local edema disappears and there is no protrusion to compress the nerve and spinal dural sac, the pain disappears.

The spine can be regarded as an upper and lower cylinder, and the spinal nerves are all behind the cylinder (back). When you push your stomach forward, the cylinder (spine) protrudes forward, and the space behind it (spinal cavity) will shrink, which will aggravate the situation that the protrusion compresses the nerve and dural sac, so it will get heavier and heavier.