Snap, Crackle, P O P! March 9, 2012 By Dr. Gillis FA<Chiro>Question: Why is there a popping sound when a joint is adjusted? Adjustment of a joint may result in the release of a gas bubble between the joints, which makes a popping sound. The noise is caused by the change of pressure within the joint, which results in gas bubbles being released. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related