One of the most common causes of neck cracking is believed to be gas bubbles in the joint fluid. This fluid is an essential component of the joint, a type of lubricant, and is a combination of carbon dioxide, nitrogen, and oxygen.
Bubbles will come out if you deliberately turn the neck so that it crackles. The release of trapped gas explains why muscles or joints feel more relaxed after a crunch call.
Source: Ferra
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