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When you crack your knuckles, you're essentially pushing the joint into or out of its normal position. A thick, clear lubricant called synovial fluid is found in the joints between your bones. When you crack your fingers, you cause the bones to pull apart, and the pressure on the synovial fluid is reduced. Bubbles form and quickly expand and then burst.

Your thumb does not get swollen and fat. you can crack it or pop it just like you can your other fingers. it takes about 25 to 30 minutes for the synovial fluid to be put back into your thumb or fingers and then you can pop it again. though you can, i recommend refraining from doing so.

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14y ago

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