When getting a chiropractic treatment, you may hear what is called an "audible".

This is often called a "crack" or "pop".  

What is happening with the crack or pop in a chiropractic treatment?

The cracking or popping is caused by a mixture of synovial fluid and gas inside the joint.  When there is movement in the joint the sound happens stored gas (mostly carbon dioxide) is released from the joint. 

Just think about when you get a package in the mail.  Often times there is bubble wrap in the box to protect your stereo, television, computer equipment etc.  When you press into the bubble (friction), it makes a popping sound.  The gas is released from the bubble wrap.

That is pretty much like the pressure a joint gets with an adjustment.  No breaking bones, no smashing bones, just a release of gas.  

After the "pop" happens, the joint will not make a noise again until the gases accumulates into the joint again.  That is why once you hear a pop, another one can not be repeated. 

So, now after learning this information, there is no reason to fear of the sound right?  Well, if you are afraid of the sound, there are other methods of moving the joint that don't involve a popping sound and most chiropractors will accommodate you if you are don't like the sound.  

Dr. Amie Gregory, DC, CCEP, ANF uses gentle chiropractic techniques to help you heal and stay healthy.  Contact her today at the San Francisco, CA or San Carlos, CA office today.