The pain I had is the reason I went in for a mammogram. It was a sharp pain that happened twice that went from my arm pit to the point in my breast 10 o clock position, where my cancer was. I had a bilateral mastectomy. I am currently undergoing 16 rounds of radiation. I still get what they call "zingers". These are sharp quick pains. My doctors tell me it is the nerve endings coming back. I still have tissue expanders in, I think some of the pain might come from those.