Long Story Short...No. Adjustments do not always create a sound. It is a myth that it is the bones that create the sound. The sound is being produced by the synovial fluid which is a lubricant that is found in all joints throughout the body. Synovial fluid contains dissolved gases and during an adjustment, the slight movement causes a release of pressure. This release of pressure is kind of like the pressure that is released when a bottle of champagne is opened and just like with champagne, a popping sound occurs. However, it is not important to hear a sound when you get adjusted. It is important that there was movement, and that the movement was in the right direction.