my left breast became inflamed, I continued noticing discomfort; I noticed that my left breast is bigger than the right one; swollen lymph nodes (lymphadenopathy); presence of nodules (lumps) on her left breast; he caller received the booster dose Pfizer Vaccine and the left breast still hurts/she presented pain; inflammation/ my left breast became inflamed; 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 49 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 20Dec2021 (Lot number: FE3369) at the age of 49 years as dose 3 (booster), single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Bnt162b2 (First dose: , lot: EW0168, NDC: Unknown , Expiration: Unknown , Route of administration: Left side, caller clarifies as left arm, not left side. The caller received all three doses of the Pfizer Vaccine in the left arm.), administration date: 12May2021, when the patient was 48 years old, for COVID-19 Immunization; Bnt162b2 (Second dose: lot: EW0181, NDC: Unknown , Expiration: Unknown , Route of administration: left arm), administration date: 02Jun2021, when the patient was 49 years old, for COVID-19 Immunization, reaction(s): "left breast got inflammation", "when i touched I felt a strong stinging sensation on my breast", "Nodules in the breast/hard nodule/lump", "it gave me a strong pain next to the breast". The following information was reported: BREAST PAIN (non-serious) with onset 2021, outcome "not recovered", described as "he caller received the booster dose Pfizer Vaccine and the left breast still hurts/she presented pain"; BREAST INFLAMMATION (non-serious) with onset 2021, outcome "not recovered", described as "inflammation/ my left breast became inflamed"; BREAST DISCOMFORT (non-serious) with onset Dec2021, outcome "unknown", described as "my left breast became inflamed, I continued noticing discomfort"; BREAST MASS (non-serious) with onset 2021, outcome "unknown", described as "presence of nodules (lumps) on her left breast"; ANISOMASTIA (non-serious) with onset Dec2021, outcome "unknown", described as "I noticed that my left breast is bigger than the right one"; LYMPHADENOPATHY (non-serious) with onset Dec2021, outcome "unknown", described as "swollen lymph nodes (lymphadenopathy)".  Additional Information: The caller has a question about the Pfizer Vaccine the caller wants to ask if it was correct that nodes from the breast get inflammation when getting the Pfizer Vaccine. When the caller received the Pfizer Vaccine, the callers left breast got inflammation. The caller states the left was the side the caller got the Pfizer Vaccine. The caller was a respiratory therapist. When received the vaccine, left breast got inflammation: The caller states this occurred after receiving the second dose Pfizer Vaccine, but the caller does not know the exact date this began. The caller received the booster dose Pfizer Vaccine and the left breast still hurts. The caller thinks the left breast inflammation has gotten better but the caller was still worried because does not know if it was that or if caller needs to go get a mammogram. Some people told the caller the Pfizer Vaccine can cause inflammation in lymphatic nodes. New events added in the follow-up was she presented pain, inflammation and the presence of nodules (lumps) on her left breast', my left breast became inflamed', I continued noticing discomfort', I noticed that my left breast is bigger than the right one'. Event onset date added. 2nd dose new AE was captured (it gave me a strong pain next to the breast, when touched patient felt a strong stinging sensation on my breast) in historical vaccine. The caller was a consumer/patient (49 year, female), she indicates that she received the Pfizer COVID-19 Pfizer vaccine and after the 2nd and 3rd doses she presented pain, inflammation and the presence of nodules (lumps) on her left breast. She wants to know if this was an adverse event of the vaccine. 2nd dose: Patient noticed a hard nodule/lump, it gave me a strong pain next to the breast. It didn't realize when they appeared when  touched patient felt a strong stinging sensation on my breast.3rd dose: one week after the vaccine, her left breast became inflamed, pateint continued noticing discomfort, patient put cold compresses on it. Patient noticed that her left breast was bigger than the right one.  No follow-up attempts are possible. No further information is expected.