I had a masectomy in November and 3 nodes removed.I am thru chemo and feeling good. I had no pain whatsoever in my arm until about 2 months ago. I seem to be getting weaker in that arm also. I asked my oncologist about it and all he said was "anytime you have surgery you will have problems on that side". I still don't understand why it didn't hurt before and does now. I am getting worried that it could be something more serious. There is no swelling of the arm. Has anyone else experienced this? What do you do to relieve this...it is hard to sleep at night.