painful lymph nodes on her left side upper neck, jaw, and armpit  (injection side was left arm); lymph nodes in her underarms, up her neck and jaw, and her breasts were so inflamed; breasts were swollen/they were double in size; Breast pain; breasts are so inflamed; swollen, painful lymph nodes on her left side upper neck, jaw, and armpit (injection side was left arm)/breasts were swollen/they were double in size; lymph node swelling/severe lymph node swelling; This is a spontaneous report from a contactable consumer (patient). A 67-years-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Batch/Lot Number: EN6203), dose 1 via an unspecified route of administration, administered in arm left on 23Feb2021 (at the age of 67-years-old female) as dose 1, single for covid-19 immunisation (COVID-19 vaccination). Medical history included lupus (this was diagnosed 7 years ago), multiple sclerosis (this was diagnosed 15 years ago). The patient's concomitant medications were not reported. The patient had not had any other recent vaccinations or started any new medications, no other products. Reportedly, the patient had her first dose of the Pfizer Covid vaccine on 23Feb2021, 5 days later she had a mammogram, and then 8 days later (on the 13th day after her vaccine) started to experience swollen, painful lymph nodes on her left side upper neck, jaw, and armpit (injection side was left arm) in Mar2021. Her mammogram readings were affected by her swollen lymph nodes that were potentially from the vaccine. Clinical course was as follow: The patient was calling about the Pfizer COVID-19 vaccine to provide information about a problem she had which was a mammo effect reaction (documented as reported). She said she had her first dose of the vaccine then went for her mammogram on 01Mar2021 which was approximately 5 days after she had the vaccine and she had gotten information from the doctor's office afterwards. She received a letter from mammogram doctor saying that she needed to schedule a second mammogram and an ultrasound, and that the situation was they needed to redo the mammograms due to abnormalities. She heard from someone, but not her doctors, that there had been information in circulation about vaccine affecting mammograms. She has been trying to get ahold of her gynecologist to confirm that, since when she got the mammogram no one knew about it, she went in under the wire. She said she had got a flare up that started on the 13th day after her vaccine with her lymph nodes that was very severe and has gone on for 5 days. She didn't know if having a mammogram increased that or not, but she wanted to report it. In Mar2021, she had very severe lymph node swelling, and her breasts were swollen as well. She says she didn't know; part of her lymph nodes was very painful. She was due for her second mammogram which was scheduled. Her lymph nodes in her underarms, up her neck and jaw, and her breasts were so inflamed, they were double in size and extremely painful in Mar2021. She said since she has had a very severe reaction to the first dose, and she had not been able to get ahold of her doctor and her lymph node has really flared, she had a question about mammogram and second vaccine shot 4 days after a mammogram (second vaccine was due 4 days after she followed up for mammogram). She was concerned about that, having a second mammogram and then a second vaccine shot. She said she knew that the second dose was more prone to people having a reaction normally, so she was wondering if having a mammogram first then the second shot would start another lymph node reaction with it being done in the reverse order for the shot and mammogram. Her second dose was scheduled on the 30th day since she couldn't get another appointment. The patient said that she didn't think that this was a normal reaction, and she was told it was not normal, but the doctors there were not up to speed with that situation. She said she also had MS and Lupus, so she was not a normal patient as well. The patient underwent lab tests and procedures which included mammogram: unknown result on 01Mar2021, urine analysis: normal on unspecified date (Verbatim: had a urinalysis that was routine which was fine and normal). For adverse event treatment of all, she was taking store brand acetaminophen, she took it two or three times since she can't take NSAIDs, and she also applied ice. She was taking two tablets each time of the over-the-counter strength acetaminophen, which was 325mg. She said she hasn't done anything else because she wanted her doctor to give her instructions. She has contacted her MD but had not received a follow up call for further guidance from them. Outcome for all events was unknown.  No follow-up attempts are possible. No further information is expected.