A subluxation occurs when a vertebrae misaligns and moves out of its normal position. When this occurs, the vertebrae can put unwanted pressure on the nerves, blood vessels, and all of its other surroundings. This pressure can cause pain which will only get worse if left untreated. It also keeps the brain from being able to properly send messages to other parts of the body, greatly affecting your body's ability to heal itself.
If left untreated, a subluxation can eventually cause the spine and its surroundings to begin a degenerative process that becomes more difficult to reverse as the body begins to adjust itself to the misaligned shape. This causes pain and keeps the body from being able to treat itself. For these reasons, it is very important to get a subluxation treated and the spine realigned as early in the phase of misalignment as possible.