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 46 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 23Apr2021 (Lot number: ER8737) at the age of 46 years as dose 2, single for Covid-19 immunisation. The patient had no relevant medical history. The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (1st dose, lot number ER8737, her 1st and 2nd doses of the Pfizer Covid vaccine were administered in the morning, she does not remember what time, but in her left arm for both doses.), administration date: 02Apr2021, when the patient was 46 years old, for Covid-19 Immunization. The following information was reported: LYMPH NODE PAIN (non-serious), LYMPHADENOPATHY (non-serious) all with onset 2021, outcome "recovered" (2021) and all described as "soreness and swelling under her left arm/ lymph node get sore and swell"; BREAST SWELLING (non-serious) with onset 2021, outcome "unknown", described as "swelling moved to her chest area, and it is swollen and is over her left breast". Additional information: Additional Vaccines Administered on Same Date of the Pfizer Suspect was None. Prior Vaccinations (within 4 weeks) was none. Patient's Medical History (including any illness at time of vaccination), and Family Medical History Relevant the events were none. Vaccine was not administered at PRIVATE Facility. States she just takes vitamins every day and birth control and that's it; states she began taking the vitamins and birth control prior to the Pfizer COVID-19 Vaccine and has taken those for years. Relevant Tests done were none. Patient stated that she had her first, second, and third doses of Pfizer Covid vaccine, and after the second dose she experienced soreness and swelling under her left arm and she also experienced the same after the booster dose. Caller said, "I know that the lymph node get sore and swell a bit because I know after the second shot that's what happened so I was expecting it, however what I was not expecting was for the swelling to move over and its kind of in my the left area of my chest, so its swollen just above my left breast". Caller wanted to know if she need to go to doctor and have somebody take a look on this or this is expected. Patient stated with the original lymph node swelling and soreness she had the lymph node sore back in April and the first dose of the Pfizer Covid vaccine was on 02Apr2021 but clarified later in the call that the reported event did not occur after the 1st dose of the vaccine but occurred after the 2nd dose of the vaccine. Also Stated two weeks after the 2nd dose was when she had sore lymph nodes and she did not get that after the 1st dose of the Pfizer Covid vaccine; states the soreness and swelling went away 4-5 days later and the latest soreness and swelling of the lymph node was on Sunday 28Nov2021 after she had the Pfizer Booster vaccine on 27Nov2021. Reporter stated she got the Pfizer booster shot and had the first two Pfizer Covid-19 shots in April and had some side effects and one was her lymph nodes got a little swollen and sore under her left arm which she kind of expected for this and also got the flu shot this year and this was the 1st time getting the flu shot where her lymph node was hurting for that. Stated she had the Pfizer Booster vaccine just this past Saturday and the lymph node was hurting again and was very sore and she did not expect that, and it looks like it moved over, and the swelling moved to her chest area, and it is swollen and is over her left breast. she just wanted to make sure it is not anything she needs to go to her doctor about and she realizes there are some side effects, and it is different for everybody, but this is something that didn't come up when she got the first two Pfizer Covid-19 shots. Stated the lymph node swelling and soreness is currently under her left arm, is ongoing and worse than it was on Sunday and yesterday and today is the same for soreness and swelling; stated yesterday she realized the swelling had gone into her chest area on the left side. The booster was administered on Saturday 27Nov2021 with lot FH8020 at 3:15pm in her left arm. States her reported symptoms began Sunday late morning around 11:00am and she got up and went to the grocery store and was feeling ok but started feeling a little draggy and a little achy; states she feels better with that now but the achy and draggy feeling was ongoing yesterday and lasted a couple of days but she is better with that now and the lymph node and sore arm is still there and she feels a little sore and it is a little hard where the shot was. Hospitalization, emergency room, Physician Office visit not required. Reporter seriousness for the events was unspecified. Follow-up attempts are completed. No further information is expected.