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Hi, I had a left mastectomy last August  followed by ANC in September. I'm currently getting chemo before going onto Tamoxifen in March. Over the previous 6 months I have done, and continue to do exercises on my left arm to increase its strength and mobility. The pains and discomfort I have felt during the last 6 months have reduced and I tend to describe them more as discomfort. For the last couple of days I have had that tennis ball in the arm pit feeling again. Its the first time for a while and I'm a bit concerned as to whether or not this is 'normal' This morning I went to visit friends and drove for the longest time I have in the last 3 months, only 1/2 hour though. When I got out of the car I felt something 'twang' on my left shoulder. Almost like an elastic band had been stretched, then plucked. Sorry thats the only way I can describe it. It went in a straight line from the top of my shoulder, down to my armpit. No major pain but and nothing since. Any ideas what it could have been?
I was also wondering, presuming this was a one-off thing with no further issues surrounding it, how long do these pains and episodes of discomfort last after surgery? Will I ever get to a point were both arms feel the same, and normal?