menstrual bleeding; this is a spontaneous report received from a contactable reporter (consumer or other non hcp) from the regulatory authority. the reporter is the patient. regulatory number: nl-lrb-00734294 (agency). a 51-year-old female patient received bnt162b2 (comirnaty), administration date 02nov2021 (lot number: unknown) as dose number unknown, single for covid-19 immunization. relevant medical history included: "menopause", start date: 2018 (unspecified if ongoing), notes: i have not had a period in the last 3 years. the patient's concomitant medications were not reported. vaccination history included: comirnaty (dose number unknown, single), administration date: 02jun2021, for covid-19 immunisation, reaction: "no adverse reaction". the following information was reported: postmenopausal haemorrhage (medically significant) with onset 03nov2021, outcome "recovering", described as "menstrual bleeding". case summary and reporter's comments text biontech/pfizer vaccine (comirnaty) past drug therapy biontech/pfizer vaccine (comirnaty): yes adrs: no date: 02jun2021 menstrual bleeding additional information adr: i have not had a period in the last 3 years. bleeding started the day after the vaccine and continued in the following weeks as well. covid19 previous covid-19 infection: no no follow-up attempts are possible; information about lot/batch number cannot be obtained. no further information is expected.; reporter's comments: biontech/pfizer vaccine (comirnaty) past drug therapy biontech/pfizer vaccine (comirnaty): yes adrs: no date: 02jun2021 menstrual bleeding additional information adr: i have not had a period in the last 3 years. bleeding started the day after the vaccine and continued in the following weeks as well. covid19 previous covid-19 infection: no