Back pain that comes and goes can also happen when the muscles or ligaments are not able to control the movement of a spinal vertebra, leading to spinal instability. Ligaments connect bone to bone, helping to limit the amount of movement of a joint. If the ligament has been stretched, it looses its ability to hold the joint stable. The abdominal and low-back muscles also provide support for the lumbar spine, much like guide-wires hold the mast of a ship. If the abdominal muscles are weak from postural changes or from not being exercised, the unstable vertebra may be source of recurring pain. Daily activities put extra strain on the unstable joint leading to extra wear and tear. It's like driving around with loose lug nuts on the wheel of your car; after a while you start to notice abnormal wear and tear. Whether the problem is from a weakened disc or from a spinal instability, you may benefit from a lumbar stabilization training program.