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Discs situated between the spinal vertebrae absorb shock and facilitate movement. Bulging discs, which typically surface in the lower back, occur when a weakened or deteriorated disc swells through a crevice in the spine, extending outside of its normal jurisdiction. This condition happens when a disc shifts out of its normal position, usually slowly and over a long period of time. As the disc moves, its inner, liquid-like nucleus begins to balloon toward the weakest point in its hard outer casing.