Weak; Tired; booster; Fever after booster; Diarrhea, chronic, after booster/ The caller thought her diarrhea was improving until this morning; Chills after booster; Vomiting after booster; 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 08Nov2021 09:00 (Lot number: FH8028) at the age of 69 years as dose 3 (booster), single for covid-19 immunisation. The patient had no relevant medical history. The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (Dose 1, single ), for COVID-19 immunization; Bnt162b2 (Dose 2, single, ), for Covid-19 Immunization. The following information was reported: IMMUNISATION (non-serious) with onset 08Nov2021 09:00, outcome "unknown", described as "booster"; VOMITING (non-serious) with onset 2021, outcome "recovered" (2021), described as "Vomiting after booster"; PYREXIA (non-serious) with onset 08Nov2021, outcome "recovered" (2021), described as "Fever after booster"; DIARRHOEA (non-serious) with onset 08Nov2021, outcome "recovered" (2021), described as "Diarrhea, chronic, after booster/ The caller thought her diarrhea was improving until this morning"; CHILLS (non-serious) with onset 08Nov2021, outcome "recovered" (2021), described as "Chills after booster"; ASTHENIA (non-serious) with onset 09Nov2021, outcome "recovered" (2021), described as "Weak"; FATIGUE (non-serious) with onset 09Nov2021, outcome "recovered" (2021), described as "Tired". The events "vomiting after booster", "fever after booster", "diarrhea, chronic, after booster/ the caller thought her diarrhea was improving until this morning" and "chills after booster" were evaluated at the physician office visit. Therapeutic measures were taken as a result of vomiting, diarrhoea.  Additional Information: The patient stated after first two shots didn't have any reactions. There was no Product Complaint. The patient did not require Emergency Room or Physician Office visit for any adverse events. Patient had no Prior Vaccinations within 4 weeks. Patient had no adverse events prior vaccinations. Patient had no family medical history relevant to adverse events. Patient had no relevant tests. Patient stated she has a side effect that she has not reported and wants to know if this has been reported by others as well. Patient said she had very long term diarrhea which started the night she got the Comirnaty booster shot and along with this are other side effects such as vomiting, chills, and fever. Patient mentioned those all went away except the diarrhea which has been going on for 3 weeks now. The caller knows this is from the vaccine and no one else in her family had intestinal stuff go on. Finally last week the caller was able to reach her fill in doctor, they recommended her to take some things for it on the 24Nov2021 she started. The caller started on Imodium, flora stora probiotic, naproxen in case it had to do with inflammation of that area. The caller did this and by Saturday morning she had what she thought was her last episode. The caller stopped taking Imodium and was fine for the rest of the day night and the next day. This morning the diarrhea came back and the caller called the Imodium helpline and said she could go back on it. The caller thought that between having no episodes and when she went today it was something that looked familiar, a regular looking bowel movement and then some loose stuff. Then half an hour later it was water. The caller took Imodium this morning and hasn't had any issues since but who knows. This is worrying the caller because she knows it can be a side effect of the vaccine. The caller thought her diarrhea was improving until this morning but she wouldn't considered it worsened.  Follow-up attempts completed. No further information expected.