Her bleeding is also very different, it is blood like she cut her wrist.; anemic; blood pressure dropped; dizzy; tightness in chest; lowered her hemoglobin.; tired; two weeks later she started a period and has not stopped since then; This is a spontaneous report from a contactable consumer or other non hcp. A 51-years-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection, Batch/Lot Number: not reported; Expiry Date: Unknown), dose 2 via an unspecified route of administration, administered in Arm Left on Mar2021 (at the age of 51-years-old) as dose 2, single for covid-19 immunisation.  Medical history included ongoing anaemia. There were no concomitant medications. Historical vaccine included bnt162b2 in left arm in mid Feb2021 for covid-19 immunization as 1st dose. In Mar2021, the patient experienced "two weeks later she started a period and has not stopped since then, on an unspecified date her bleeding is also very different, it is blood like she cut her wrist, anemic, blood pressure dropped, dizzy, tightness in chest, lowered her hemoglobin, tired.  The patient underwent lab tests and procedures which included blood pressure measurement: dropped, haemoglobin: lowered. Therapeutic measures were taken as a result of blood pressure dropped, dizzy and tightness in chest.  It was reported the patient had a period close to 3 months now since she had the second dose. She asked if other people have had this experience. She wanted to know if this has been reported and how long it lasts. She had second dose in early-mid Mar2021 and 2 weeks later she started her period and it has yet to stop. She explained it has gotten less but it is still going and going. She talked to doctor about this but didn't relate it to the vaccine but then she heard other people have had this experience. It is explained she is pretty regular so she wanted to call and report this in case there are others who have the same experience. She had the shot done through (facility name) at 2 different locations. She explained that she tends to be anemic anyway and so this has lowered her hemoglobin. The caller stated she did not want to do a full report and only want this call handler to get the essential as she is very tired and has a lot to do. She started her period on 26 or 27Mar2021, it wasn't due till the second week of Apr2021. She said she thinks it is a little less; it will get less and she will think it's almost over but then 12 hours later she is back to bleeding again. Her bleeding is also very different, it is blood like she cut her wrist. The patient was at that age of early menopause and so at first she chalked it up to that. Then the caller explained she had another friend that reported the same experience and that she had the Pfizer vaccine also. She reported she would see someone the next day to get blood work and then she would be referred to a gynecologist.  When asked if she had gone to the emergency room related to the event, she stated no but did have an episode this morning and thought about. She reported she felt like her blood pressure dropped, she was dizzy and had tightness in chest. She treated this by having orange juice, took a nap and got herself together. It is explained that she has felt similar to this before and it was that her hemoglobin was low. She said she thinks it was related to the bleeding and losing a lot of iron. She then called the doctor and has an appointment for the next day at 1:30. She has done nothing else other than just home treatment of the symptoms. Both doses were given in the left arm. She doesn't have her card with her right now and therefore has no NDC, Lot, or Expiry. She asked if anyone has reported this before. She would also like to know how long this would last if it is related. She has had no other vaccines on the same day of the COVID vaccine. Outcome of the event Menstruation prolonged was recovering and outcome of other events were unknown.   Follow-up (20Jul2021): This is a follow-up spontaneous report from a contactable consumer. This consumer (patient) reported for herself included outcome of the event and clinical information.   Information about lot/batch number has been requested.