Carpal Tunnel? Arthritis?

[thesilence]

My left hand has been locking/cramping when I grip small objects and exert a good bit of force (i.e. using a screwdriver) but it doesn't bother me when I'm playing bass could I have either of these or could it be something else?

 

[fearceol]

Depending on how you use your hands (your type of work for example), it could be any of these things. IMO, it would be a good idea to have a doctor give you a diagnosis. Try some of the yoga exercises in the link below.