acute abdominal infection; acute appendicitis; changes in her bowel habits; This is a spontaneous report from a contactable consumer (patient) reported for herself. A 64-year-old female patient received bnt162b2 (Pfizer COVID19 vaccine), dose 2 via an unspecified route of administration, administered in Arm Left on 09Jan2021 in the morning at 64 years old (Batch/Lot Number: EL3246) as dose 2 single for covid-19 immunisation. The patient's medical history was none. There were no concomitant medications. The patient didn't have other vaccines administered on Same Date of the Pfizer Suspect or within 4 weeks. Historical vaccine included 1st dose of bnt162b2 administered on 19Dec2020 at 64 years old with lot EL0140 for covid-19 immunisation. The patient experienced acute appendicitis on 27Jan2021, acute abdominal infection in Feb2021, changes in her bowel habits in 2021. The patient was hospitalized for acute appendicitis from 27Jan2021 to 28Jan2021. The patient was hospitalized for acute abdominal infection from 13Feb2021 to 17Feb2021. Clinical course: Caller states she is calling about the Pfizer Covid19 vaccine and stated she had the first dose of the vaccine on 19Dec2020 and the 2nd dose on 09Jan2021 and then on 27Jan2021 which was two weeks later she was admitted to the hospital with acute appendicitis and had her appendix removed and subsequently heard a couple of health care providers say there is a 50 percent increase in appendicitis issues for people who had the covid vaccine and she just wanted to giver Pfizer this information in case. Caller stated she went into the hospital on 27Jan2021 and was admitted that same morning for surgery that afternoon and went home the next day from the hospital on 28Jan2021 and it was a laparoscopic surgery and then two weeks later she was readmitted to the hospital for complications and it was acute abdominal infection and was admitted 08Feb2021 according to her anesthesia records but does not remember where she filed this information and then clarified to states the 2nd hospital admission was two weeks later after her surgery and she was admitted on 13Feb2021 and discharged on 17Feb2021. First hospitalization was overnight and the second hospitalization caller states was for 5 days. Caller states her symptoms have resolved from the actual appendicitis and resolved on 08Feb2021 when she was discharged and has had occurring symptoms of changes in her bowel habits that have recently resolved. States her 2nd dose of the Pfizer COVID19 vaccine was administered the same place in her left arm but it could have been her right arm. States she initially went to the doctor's office on 27Jan2021 and they said they definitely wanted her to have a cat scan and she ended up going to the hospital and was admitted from that facility for surgery. States when she had the initial symptoms she thought here was her annual 24 hour flu and then noticed she had the most pain in her right lower quadrant and still had her appendix and thought that could be a concern so she went in to get a physical exam and they said she definitely needed a cat scan to rule out and then she never left the hospital until they took her appendix out and it was a pleasant experience because she knew the medical team. States she is on no medications. Caller states for the other patients she mentioned that had appendicitis issues she wishes not to provide any information for them or for their vaccines as she is related to them and does not want to say. Relevant Tests included Cat scan on 27Jan2021, no more information available. The 3rd dose was given to her on 20Oct2021 with lot FF2590 and the 3rd dose was way past her appendicitis attack. She got the flu vaccine the same day with her 3rd dose of the Pfizer COVID19 vaccine. The outcome of acute appendicitis was recovered on 08Feb2021, of acute abdominal infection was unknown, of changes in her bowel habits was recovered in 2021.  Follow-up attempts are completed. No further information is expected.