In reality there is no such thing as a slipped disc. Discs cannot slip because they are attached to the vertebrae above and below by strong ligaments. When a disc herniates, the jelly center squeezes out through the disc wall putting pressure against a nerve. While pain in the back and leg from pressure on the nerve can be relieved by various treatments, the damage done to the disc will be permanent and may have real consequences. Aging also results in a decrease in blood supply to the disc by age 20.
Dehydration also occurs with aging.
This leads to a flatter, drier disc more susceptible to herniation. Nerves Nerves in the lower back come together to form the sciatic nerve, which runs down the back of the leg. These joints link the vertebrae together along with the discs in front allowing for complex spinal motion. These joints may be injured by lifting or straining, severe twisting or hyperextension. Rest, ice and a few Aspirin will often help the pain.