I went to my primary care doctor office to get my monthly b-12 shot today and asked if she would give it in my right shoulder as my left was where I got second covid shot a couple days ago. I asked why my arm hurt so bad the first time but not so much the second dose. the nurse said sometimes it's not the shot per se but where on the arm the nurse gives it. She said if the nurse gives it high near the shoulder it is more painful???? I also asked about why my mammogram was cancelled due to the vaccine and she said the same thing a previous poster had said.....the vaccine is causing some lymph nodes to swell and show up on the mammogram?

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