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What causes the cracking sound during an adjustment
The sound is no reason to be concerned. The sound is not coming from the bones themselves. It's coming from a lubricant called synovial fluid that's found in every joint. That fluid contains 
dissolved gases. During the adjustment the joints are slightly separated to move into proper position. This releases the built-up pressure on the fluid and gasses and creates a “pop” similar to the release of pressure when the cork comes off a bottle of Champagne. 

Not all patients “pop” and not all adjusting techniques produce the noise, which means an adjustment can be proper and effective, even if you do not hear any noise. Will repeated chiropractic adjustment lead to arthritis? There is no evidence to suggest that manipulation of the spine or other chiropractic care can lead to arthritis. On the contrary, chiropractors often care for people with arthritis by maintaining joint health. Motion is life when it comes to joint health.