Don’t listen to those people that tell you cracking your knuckles will cause you to have arthritis. At this point it’s just a speculation, not wild, but certainly not founded on anything but misconceptions. All you’re doing is playing with the physiology and chemistry of your body a bit.
Being a knuckle cracker myself, this is a myth I’ve heard countless times. I’ve even had people get upset because they literally thought I was hurting my body. As this article shows, there is absolutely no proof that you can get arthritis from cracking your knuckles. It goes on to mention though that if you are seriously chronic, you -will- suffer other problems such as soft muscle tissue.