i have very rarely, but sometimes like something's jumping in the musle. And i can feel it with other hand. Like muscle seasure. But it's not only in muscles... So it's not. It's at random place or two places sometimes... But Very, very rare. What that could be?
And sometimes, even more rare, in a few months a time or something i got a hand pain in the shoulder, left or right. But that's i think could be caused because of not relaxed hand near computer mouse or keyboard. I'm 18 years old.