The “pop” is the release of pressure in a spinal joint. This pressure builds up when the the joint looses motion. By releasing the pressure, nerves are normalized. Then any muscle spasm/pain is reduced and the body’s overall stress reduces.
The popping, cracking sound during a chiropractic adjustment has a rare 1 in 10 million chance of causing death. With an x-ray analysis the chance goes to 1 in 100 million. 300 Americans die daily from taking their normal medications, on average.
By looking at an x-ray analysis BEFORE an adjustment, your chiropractor and yourself can understand WHY your spine may need increase motion.