Are you a knuckle-cracker?
I am, and it’s an annoying habit. Not only for myself, but for others around me that have to listen to that popping sound throughout the day.
But is it dangerous, or harmful? Will I get arthritis? Will my knuckles deform and swell, until they’re unrecognizable?
The answer is no. Thankfully the practice of knuckle-cracking isn’t harmful. The truth is that when you crack your knuckles, you aren’t actually cracking your bones. Instead the noise comes from Synovial fluid. As that fluid expands it creates tiny bubbles between your joints. When you flex your fingers, cracking them, those bubbles pop.
Here’s a more scientific explanation, thanks to Discovery.