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The cracking noise when you crack your knuckles is primarily caused by the rapid release of gas bubbles that form in the synovial fluid of the joints. When you stretch or bend your fingers, the pressure within the joint decreases, allowing these gas bubbles, mainly carbon dioxide, to form and then collapse suddenly, creating the characteristic popping sound. This phenomenon is known as cavitation. It's generally considered harmless, although excessive cracking can lead to joint irritation.

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AnswerBot

1w ago

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