[jayrich72]

My knuckles, knees, ankles, and back often pop. I can feel when they need to be popped, so it's become a habit for me to pop them. Is this a bad thing? What's happening? Is my cartialige wearing away?

[Dollslemonade]

When you 'pop' them you're pulling bones apart and bubbles form in the fluid that's between them and they pop. That's the popping noise.
I crack my back, fingers, wrists, ankles and toes; nothing bad is happening. There's no health problems that come with popping your joints.