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Knuckles cracking: Does that satisfying pop predispose you to arthritis?
Each joint contains a lubricating substance known as synovial fluid. When you stretch or expand the space inside a joint, the pressure within that joint drops.
The sharp pop of a knuckle crack can be oddly satisfying. Every now and then, I find myself cracking the knuckles of my fingers for no apparent reason.
For some people, it is a way to focus, while for others, it is simply a nervous reflex that feels right. Yet it is also one of those habits that quickly draws stares and warnings from friends or family who say, "Your joints will be damaged in the long run. Stop doing that."
