The Two Most Common
Manipulation creates the noise you hear when gas is released as joints in the neck area are unlocked, reset, and/or realigned and their normal function is restored.
Mobilization does not involve the noise. Instead, the neck is moved gently in a side-to-side or figure eight motion in an attempt to restore proper function.
Which is better? Recent research has shown..."There is moderate-to-high quality evidence that immediate clinically important improvements are obtained from a single session of spinal manipulation. The evidence for mobilization is less substantial, with fewer studies reporting smaller immediate changes."
Most likely, both treatments together are helpful.