Contrary to popular belief cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting. However if done too much, it can cause tissue damage.
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From @alex95
Contrary to popular belief cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting. However if done too much, it can cause tissue damage.