Should you stop cracking your knuckles?

# Summary While the popular belief that knuckle cracking causes arthritis has persisted for decades, scientific evidence does not support this claim—one man's 50-year experiment and various studies have found no link between cracking knuckles and arthritis development. When you crack your knuckles, the sound is produced by bubbles forming and collapsing in the synovial fluid that lubricates your joints as pressure changes. Between 20-50% of people crack their knuckles, and current research suggests the habit is generally not harmful, though the exact long-term effects continue to be studied.