If I swing my head from side to side (think shaking "No" very quickly, there is a distinct crack/pop sound.<BR><BR>If I leave it for more than an hour the noise is audible, but less than than it's ...

The term “cracking” when referring to neck cracking is the popping sound that occurs when quick motions loosen the joint and ligaments in the neck. Some chiropractors may crack the neck as a treatment ...