Days after vaccination she noticed "breast tenderness", asks if this symptom may be associated with the vaccine/ acute breast tenderness with a sudden onset, bilaterally; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 69 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 21Mar2021 15:45 (Lot number: EP6955) at the age of 69 years as dose 1, single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. The following information was reported: BREAST TENDERNESS (non-serious) with onset 24Mar2021 14:00, outcome "not recovered", described as "Days after vaccination she noticed "breast tenderness", asks if this symptom may be associated with the vaccine/ acute breast tenderness with a sudden onset, bilaterally". Therapeutic measures were not taken as a result of breast tenderness.  Additional information: 69-year-old consumer received her first dose of the Pfizer-BioNTech COVID-19 vaccine on 21Mar2021. Days after vaccination she noticed "breast tenderness", asks if this symptom may be associated with the vaccine. She has used a "gynecologic treatment, applied" for several years, but never experienced breast pain, she only noticed it after vaccination. She did not provide additional information about the "applied gynecologic treatment" used. Caller states she was calling about the Covid 19 Vaccination by Pfizer. Caller stated she has just a though that crossed through her head today, she received the shot on 21Mar2021 and she was 69 right now and post-menopause and she has been for years. Stated there have been no changes in her medical regimen or treatment for years, the only thing different was she received the vaccine. She stated a few days after the vaccine, she had acute breast tenderness with a sudden onset, bilaterally. Stated she thought it was maybe a hormone adjustment, but she has had none for literally over 15-20 years. Stated she will address this with her doctor, she does have an appointment. Stated she though what new thing has she done and the vaccine was it. States she already has an appointment with her provider and doesn't want to provide his information at this time. Clarified she experienced it and the tenderness started with her nipples as she put her shirt on, it rubbed against it. Stated sometimes there has been information about this with cycles but she hasn't had cycles for years. Stated the only new thing was the vaccine. Stated she continues to have this and at the moment it was tolerable. Stated her immediate concern was that she was due for the second vaccine since it has been 3 weeks. Stated she thought maybe it was related but she checked with the medical information line and they said the package insert had no mention of anything like that. Adverse event did not result in Emergency room visit. Physician Office: Yes; will be going to see her physician because unusual after years. Prior Vaccinations (within 4 weeks): None. AE(s) following prior vaccinations: None. History of all previous immunization with the Pfizer vaccine considered as suspect: None. Additional Vaccines Administered on Same Date of the Pfizer Suspect: None. Family Medical History Relevant to AE(s): None. Investigation Assessment: No.  No follow-up attempts are possible. No further information is expected.