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Cracking your knuckles is a way of releasing air from between your joints that really needs to be released, But doing this as a habit can cause arthritis When your joints keep rubbing together can cause stiffness, as i said before can lead to getting arthritis.
It is bursa sac fluid that moves out of the joint that causes the cracking sound.
Nothing to serious. But uf u do it all the time, once ur older ur hands culd get f***ed up.