When you visit a chiropractor, one of the most common phenomena you might notice during an adjustment is the “cracking” or “popping” sound that accompanies the realignment of your joints. While it may sound alarming to some, this noise is completely natural and harmless. Understanding what causes this sound can help ease any concerns and give you a better grasp of what’s happening during the procedure.

The cracking noise is most often associated with the release of gas from the synovial fluid within the joints. Synovial fluid is a viscous substance that lubricates the joints and helps them move smoothly. This fluid is made up of gases, such as oxygen, nitrogen, and carbon dioxide. When a joint is adjusted—whether it’s the spine or another part of the body—the chiropractor applies a specific force that causes the space between the bones to slightly widen. This sudden change in pressure allows the gases dissolved in the synovial fluid to form bubbles, which rapidly collapse or burst, creating the characteristic popping or cracking sound.

The process that occurs when a joint is adjusted is known as “cavitation.” Cavitation is the formation and sudden collapse of these gas bubbles. It’s a normal, physiological response to the pressure changes in the joint, and it doesn’t indicate any damage or harm to the body. The popping sound is not the sound of bones grinding against each other; rather, it’s the result of gas release from the synovial fluid.

Another important point to note is that the cracking sound doesn’t necessarily correlate with the success of the adjustment. Some patients experience the noise more frequently than others, while some may not hear it at all, even though their joints have been effectively realigned. The sound is simply a byproduct of the adjustment process and doesn’t affect the therapeutic outcome.

While the cracking sound is often what most people associate with chiropractic care, the real benefit of an adjustment comes from the improved alignment of the spine or joints, which can lead to reduced pain, increased mobility, and better overall function. If you’re ever curious or concerned about the sounds you hear during an adjustment, don’t hesitate to ask your chiropractor—they’ll be happy to explain and ensure you feel comfortable throughout your treatment.