Is cracking your fingers bad?
You may have grown up under the impression that cracking your fingers could cause harm. Personally, I can remember my mother telling me that it would cause arthritis. But in fact, cracking your knuckles will cause you no harm.
When you crack your fingers, it releases negative pressure that builds up in your joints. Synovial fluid covers cartilage in joints to protect them, and when you hear that popping sound, it is actually the breaking of the seal of the synovial fluid. It takes about 20 minutes for the seal to re-establish itself and cracking can begin again.
There is no harm with cracking your fingers but do please be aware of people around you and how it makes them feel.
Editor: Ryan Cranston