felt sick for a day; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP).  A 71 year-old female patient received bnt162b2 (BNT162B2), administered in arm right, administration date 09Feb2021 13:00 (Lot number: EL9269) at the age of 71 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Breast cancer", start date: Nov2008 (unspecified if ongoing), notes: Pertinent details: Surgery chemo radiation. Family history included: "cancer" (unspecified if ongoing), notes: Caller states his mom had cancer but that was years ago. There were no concomitant medications. The following information was reported: ILLNESS (non-serious), outcome "recovered", described as "felt sick for a day". The patient underwent the following laboratory tests and procedures: computerised tomogram: (02Apr2021) unkmown results, notes: Comments: All tests negative or normal; electrocardiogram: (02Apr2021) unknown results, notes: Comments: All tests negative or normal; magnetic resonance imaging head: (02Apr2021) unkmown results, notes: Comments: All tests negative or normal.  Additional information: NDC number of pfizer and expiry date covid vaccine were unknown. Reason for no lot number of pfizer covid vaccine provided as other caller does not have this information to provide. Caller states he is calling regarding the Covid booster shot. After reporting his experience, he stated that his mom also suffers from vertigo and motion sickness. She had pretty severe vertigo like he did. After his mom's booster, she ended up in the hospital. He states his mom had a similar reaction as he, the caller, did. She ended up in the hospital and she did not even tell him it was because of the shot. He states that his mom did not tell him until a couple of days ago. Declined to provide. Caller states he does not use his email that often. Caller states that 3 weeks after she got her shot, his mom had severe vertigo. She could not control her bowels, either way and she basically could not stand. She still can not sleep on her right side. If she does, it triggers her. Driving for her, is very minimal and she hardly ever drives anymore. She can not drive at night anymore. He states his mom has been having major issues. Age adverse event(s) started, He states she would have been 71, it was this past Apr2021. He states that this happened with her second Covid shot. Primary / Prescribing Healthcare Professional Information as unknown. Caller states he does not know her name but states that his mom did tell him the other day that her doctor told her that exactly 3 weeks after she got her shot, she had  the same thing happen. Caller states, he thinks and is 95 percent sure, his mom said she was going to call Pfizer because she gave him the number to call. He states she will probably be able to give everything about it. Clarified that his moms symptoms started exactly 3 weeks after she got the second Covid shot. He states that she ended up in the hospital. Clarified that she was admitted to the hospital and kept overnight, for one night. Clarified that the callers mother had taken the first two doses of the Pfizer Covid vaccine and the Covid booster. He clarified that the he thinks she had the booster in Aug2021 or Sep2021 but states that when she had the booster, she had nothing. With her first shot, she felt sick for a day and it was the second one that got her. NDC, LOT, EXP first 2 doses Pfizer Covid-19 vaccine and booster shot unknown. Caller does not have this information to provide. She did not really know much, she went to the hospital and was released. She was real low key about everything until the other day. He states that she is now having diarrhea of the mouth, telling everything about what happened to her. For vaccination facility type was physician hospital. Vaccination Facility Address reported as facility name withheld. Adverse event require a visit to emergency room and was admitted to hospital for one night physician office. Caller states that his mom has continued to go for follow up appointments and has gone to physical therapy. She has done a lot of stuff for this. Patient was hospitalized, in the hospital for one night. No prior Vaccinations (within 4 weeks). Patients medical history (including any illness at time of vaccination was none.   No follow-up attempts are possible. No further information is expected.