Have you been having too much caffeine, that could be the cause. It might also be due to a lack of muscle strength in your arms.
MangaDex Forums
mylovenovels
Mangamoz
Oh dear, are you overdrawing to the point of hand exhaustion? You need to take healthy breaks in between big art projects. Or else you will end up like me, with a nasty carpal tunnel that ended my drawing days.
cigarsuger
@Mangamoz
I will probably take a massive break for a week or two
I will probably take a massive break for a week or two
athayanezant
@cigarsuger have you ever try using slime to relax your hands? I sometimes use it to relax my hands muscle, I'm following some YT tutorials for that. and please don't forget, if you gonna take a break from drawing, please keep exercise your hands, like playing with slime, play dough or clays, don't let your hands do nothing for more than a week. also, you should get enough sleep and drink water more. sorry I'm just sharing what I know from my own experience 
cigarsuger
@athayanezant
I’ll take your word for it thanks so much for the tips! I might actually go out and buy some slime just to save my fingers.
@mylovenovels
I’ll take your word for it thanks so much for the tips! I might actually go out and buy some slime just to save my fingers.
@mylovenovels
From time to time, I do especially when a commission needs to be finished the next day. I really need to set some boundaries next time so I can actually take care of myself.