There is a myth that cracking your knuckles can cause arthritis or make your fingers grow larger; I was frequently told this since I had a habit of doing so.

Myth on Cracking Knuckles
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Ellen
Hi
I think I have heard this myth before. However, it does stop me from doing so. It’s always nice to know that I am not the only one who wonders about this myth.
Ishmeet Kaur Dhillon
I totally agree. I have heard this myth before. I have grown up with my parents stopping me to crack my knuckles but it so addictive.