| Don't know how old you are, but could it possibly be a touch of arthritis? Maybe from an old injury or something? Try warming it rather than icing and see if that loosens it up or alleviates any of the pain. Also, massage around the joint, and gently stretch it in all directions. I am still pretty young but I occasionally get stiffness in my hands as well. I have had a couple of injuries though. I keep one of those squishy squeeze balls on my desk at work, and I squeeze on it when my hands are stiff. It really does help.
Of course, my husband says that his middle finger is always sore from flipping off drivers, so ... |