What is the cracking sound?

What is the cracking sound?

The cracking sound when a joint is adjusted is the release of gas pressure in the joint. There is gas dissolved in the fluid inside joints and when the pressure is altered by stretching it, gas bubbles are released. It is similar to what happens when you open a can of pop. The purpose of an adjustment is not to make a cracking sound but rather to normalize the movement and alignment of the joint. The occasional crack that occurs is simply a side effect of treatment that many patients welcome.