l have had breast cancer with chemo and radiation left side, 25 years ago. for 5 years I have been dealing with with numbness in my hand and fingers. I have been been to many hand doctors. not one could explain what was happening. started with ulnar surgery which did nothing. I have had 4 now emgs. sticking needles in my arm. now this last year it has creeped up my arm. I have no use of my arm now, totally numb. I was referred to a neurologist. after 3 MRIs , another emg and blood work. he took 8 viles of blood. my final diagnose was radiation leaked in to my brachial plexus nerves from 25 years ago. I was shocked. no cure for me. will try physical therapy. he said might help. it has been a long and hard battle to find out I cannot be fixed. good luck.