What does cracking your knuckles give you, what happens if you get it?

If u Crack your knuckles constantly then when u get a little bit older from now then you hands will start to hurt some times and my dad always said he used to Crack his all the time and now his hands have no feeling that much and he has big knuckles

I'm sure you've heard as a child, "Don't crack your knuckles because it could give you arthritis as an adult". Well, this is a completely busted myth. Yes it is bad for your joints, but as a child it shouldn't cause any problems. Your toe, finger joints, and your elbow rest in a synovial fluids. When bending your fingers or toes, these fluids tend to bubble and burst. That is why you hear the so called "Cracking sound". If you have a really bad habit, and continue to do this as an adult, it can break down the tissues and fluids that protect your joints and eventually develop osteoarthritis. But this is very very rare.