Not to sure where i should post this so i hope this is in the right place.

anyway. lately while playing bass down the bottom end of the neck my thumb sometimes twitches and sends a shock though my thumb into my hand/arm.
its happened once or twice while on the guitar aswell and i have no idea why.

any ideas on what the problem is?
how i could fix it?
i've never knowen this to happen to anyone else i know.

Thanks in advance
Cut your thumb off.
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If it is always in a similar position (bottom end of the neck) then maybe it is something to do with your posture. Does it feel like you are tensing your hand up too much?