Pain in my hand under my thumb are, whats wrong? (i have a picture inside)?

Question

I tried to do bicep curls today and my hand was hurting me today but I didn't know how much it hurt til I tried to lift and droped the dumbbell almost instantly after I felt the pain. I don't know whats the problem is, but I think it is heavy punching bag related.

Heres the picture of here it hurts

http://img529.imageshack.us/img529/9708/openhandhj1.gif

Answer 1

 hi i just had a sharp pain in my thumb !