Your grandma and teachers would always tell you: Don’t crack your knuckles, because it will lead to arthritis. But that is simply not true. According to Cedars-Sinai, the “pop” of knuckles cracking is just nitrogen bubbles popping in your joints, and any relief you feel from this action is mental more so than physical. The worst thing cracking your knuckles will actually lead to is that you will just annoy the people around you.