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Originally Posted by PrimusNut 1 finger per fret, even on the first 5 frets? That could be you're problem right there, especially on the low B and E strings. Wrist pain is far from uncommon in playing bass. I wouldn't worry about it too much unless it really bothers you. |
I'm going to have to agree. That's a pretty large neck you got (But who am I to say, I play a 4 string Rickenbacker 4003.

) and if you're playing more intense lines than you're used to, your body might just be getting tired.
I'd say give it some time, if it doesn't go away after a while, you could always see a doctor to find out what else might be causing it.