Hello -
This is most likely due to a compression of the ulnar nerve on the affected side, although the little finger (pinkie) normally would be affected as well. What isn't clear is where the
pain occurs. If it is in the fingers this is a different sort of problem. If,however, it is in the arm above the fingers, or in your neck or upper back, this could be due to an injury to the disk between C-7 and T-1 vertebrae, where the ulnar nerve outlet is located. What part of your body does your doctor want you to have the MRI done on?
Meanwhile, non-steroidal
anti-inflammatory pain meds like ibuprofin or naproxyn should help. By now you've likely had your MRI done, so if you've found out what the problem is, please let us know.
Best of luck to you. Hopefully you are feeling better now.