It is thought that one of the most common causes of neck ‘cracking’ is gas bubbles in the synovial fluid escaping a tight space. This synovial fluid is a lubricant between the joints, formed by a combination of carbon dioxide, nitrogen and oxygen.
If you deliberately roll your neck, it is thought that you can sometimes release these bubbles, resulting in a series of popping sounds that may sound like cracking. The release of the gas build-up explains why muscles or joints often feel looser and more comfortable after they’ve been ‘popped’ or‘cracked’.
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Asked by: Kevin Harding, Bedford
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