Why do my thumb knuckles always crack?
April 21, 2011 8:13 AM Subscribe
Why do my thumb knuckles always crack? And how can I stop it? It seems like every time I bend either of my thumbs all the way, they "pop". I have no other poppy bones, and I am a 28 year old male, and neither of my thumbs have ever been injured as far as I know. It started about a year ago.