How to crack your thumb

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I crack my knuckles about 30 times in one hour, and today all the joints in my fingers swelled up and when I try to make a fist, it is really weak. I am 16 and I have been cracking my knuckles a bit too much, I suppose.

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I haven't experienced any negative effects although I am 18 years old now. I have been cracking my knuckles since I was in second grade, and I want to stop as soon as I can.