premature hearth beat; limited her daily activities; Weakness; dizziness like fainting or falling down; bleeding mentioned by transfer agent was vaginal, menstrual-like bleeding. Was a pinkish, red spotting; cramps; feel the sensation of having a menstrual period; palpitations; dizziness like fainting or falling down; dizziness like fainting or falling down; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 73-year-old female patient received BNT162b2 (BNT162B2), on 26Oct2021 (early evening) as dose 3 (booster), single (Lot number: FF2589) at the age of 73 years, in arm for covid-19 immunisation. The patient's relevant medical history included: "Hashimoto's disease" (unspecified if ongoing), notes: Hashimoto's thyroiditis autoimmune disease; "she is sensitive to a lot of components in medications" (unspecified if ongoing), notes: She is sensitive to a lot of components in medications; "She is sensitive to a lot of things. doesn't do processed foods, fillers, artificial ingredients and such" (unspecified if ongoing), notes: She is sensitive to a lot of things. doesn't do processed foods, fillers, artificial ingredients and such. The patient's family history included: "Heart attack" (unspecified if ongoing), notes: Father passed away from a heart attack. Concomitant medication(s) included: LEVOTHYROXINE taken for autoimmune thyroiditis. Patient did not receive additional vaccines on same date of the pfizer suspect and did not have any prior vaccinations within 4 weeks. Vaccination history included: BNT162b2 (Dose:1, LOT: EL9261, NDC: 59267100001), administration date: 26Jan2021, when the patient was 72-year-old, for Covid-19 Immunization; BNT162b2 (Dose:2, LOT: EN6201, NDC: 59267100001), administration date: 26Feb2021, when the patient was 72-year-old, for Covid-19 Immunization; Flu shots, for Immunization, reaction(s): "felt sick", "got a sore arm". The following information was reported: ASTHENIA (non-serious) with onset 2021, outcome "recovering", described as "Weakness"; POSTMENOPAUSAL HAEMORRHAGE (medically significant) with onset 2021, outcome "recovered", described as "bleeding mentioned by transfer agent was vaginal, menstrual-like bleeding. Was a pinkish, red spotting"; MUSCLE SPASMS (non-serious) with onset 2021, outcome "recovered", described as "cramps"; SYNCOPE (medically significant), DIZZINESS (non-serious), FALL (non-serious) all with onset 2021, outcome "recovering" and all described as "dizziness like fainting or falling down"; MENSTRUAL DISORDER (non-serious) with onset 2021, outcome "recovered", described as "feel the sensation of having a menstrual period"; PALPITATIONS (non-serious) with onset 2021, outcome "recovering"; LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (non-serious), outcome "unknown", described as "limited her daily activities"; EXTRASYSTOLES (non-serious), outcome "recovering", described as "premature hearth beat". The events "dizziness like fainting or falling down", "palpitations", "premature hearth beat" and "weakness" required physician office visit. The patient underwent the following laboratory tests and procedures: Electrocardiogram: Unknown Results; heart Exam: premature hearth beat, notes: she took a heart exam during 1 week using a heart monitor. She was diagnosed with premature hearth beat; Unknown Results; Ultrasound scan: small lesions on her liver, notes: They don't think they were anything to worry about. Going to do another ultrasound of her liver to look it more closely. Therapeutic measures were taken as a result of postmenopausal haemorrhage.  Clinical course: It was reported that patient explained that she is getting ready to schedule her second booster dose of Pfizer-BioNTech COVID-19 Vaccine. She wanted to know if she should actually get this dose, because she experienced some side effects after the first booster dose back in Oct. After receiving the first booster dose, she experienced the typical symptoms for 2 days. On the 3rd day she was feeling better. Some time after, she started experiencing cramps and she started to feel the sensation of having a menstrual period. She mentioned that she even bled a little bit a couple of times. Those symptoms went away, but then she started feeling other symptoms. She experienced palpitations, dizziness like fainting or falling down, she felt weak and these symptoms limited her daily activities. He went to a doctor and she took a heart exam during 1 week using a heart monitor. She was diagnosed with premature hearth beat. After 6 months of this case, she explained that she felt much better. Patient also mentioned to have the Hashimoto's thyroiditis autoimmune disease. She explained that sometimes she is sensitive to a lot of components in medications. She does not usually have severe reactions, but she wanted to be sure that she is not allergic to any ingredients of the Pfizer-BioNTech COVID-19 Vaccine and patient wanted to know the ingredients of the vaccine. After 5 months, she was much, much better. Has Hashimoto's autoimmune disease. Sometimes she is sensitive to components in certain medications. Not usually severe reactions. Palpations, dizzy, faintness, weakness, feeling like she was going to fall down all started within a week after the booster dose. She still has these symptoms, but they are few and far between. Not as severe now. Not a problem now, but earlier she was getting so many and they were so strong. She can feel it happening, but she can sit down or slow down and let it pass. Doesn't happen often now, but it took months to get better. Verified with caller that the bleeding mentioned by transfer agent was vaginal, menstrual-like bleeding. Was a pinkish, red spotting. Wasn't full on vaginal bleeding. Lasted off and on for a couple weeks before it completely stopped. Used Motrin and a heating pad to help with that. Scared of the vaccine, but more scared of COVID. Going to schedule another booster.