You have something called "trigger finger". I used to have it when I was little like 13+ years ago. I don't have it anymore.
When I Move My Thumb, Its Like It Gets Stuck. Why Is Is Doing This And What Can I Do To Make It Stop?
Sounds like you have gamers or texting thumb from repetitive use.....have you been texting a lot? Then that's probably what it is....:)
