Weight Loss and Lack of Appetite; Weight Loss and Lack of Appetite; Headaches; Fever; Temperature; This is a spontaneous report from a contactable consumer (patient) reported for herself. An 83-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Batch/Lot Number: EN6198 and Expiration date was unknown), via an unspecified route of administration on 03Mar2021 (at the age of 83-year-old) as a dose 2, single for COVID-19 immunization. The patient's medical history and concomitant medications were not reported. Historical vaccines included BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Batch/Lot number: EL9269, Expiration date was unknown), via an unspecified route of administration in arm right on 11Feb2021 (at the age of 83-year-old) as a dose 1, single for COVID-19 immunization and the patient received pneumonia vaccine (PNEUMOCOCCAL VACCINE), via an unspecified route of administration on an unspecified date for an unspecified indication and flu vaccination (FLU VACCINE VII), via an unspecified route of administration on an unspecified date for an unspecified indication, gotten flu vaccination for years and pneumonia vaccine and never any reaction whatsoever. History of all previous immunization with the Pfizer vaccine considered as suspect: Patient has received both doses of the Pfizer Covid Vaccine. Additional vaccines administered on same date of the Pfizer suspect was reported as none. Prior vaccinations (within 4 weeks), the patient has received both doses of the Pfizer Covid Vaccine. AE(s) following prior vaccinations were reported as none, gotten flu vaccination for years and pneumonia vaccine and never any reaction. The reporter stated that, she was called about the Vaccine, the Covid19 Vaccine, verified as Pfizer. Stated that, she had talked to Pfizer Drug Safety last week and that agent took all her information and gave her a number to call if she had questions. Her daughter insisted that, she continue to call. Clarified with caller that, the symptoms she reported are the same more or less. She was not called to report new events. She provided a summary of what she reported. The reporter stated that, she needed to report what has been going on since her first shot on 11Feb2021 and her second shot on 03Mar2021 and she was still struggling. Stated that, she had headaches starting 2.5 weeks after her first shot and they kept on until 14Mar2021 when they finally went away. Stated that, she lived on Tylenol and started taking it every 7-8 hours then down to every 4 hours because she needed relief. She had headaches for 2.5 weeks after she received her first Covid 19 vaccine. She got her second Covid 19 vaccine on 03Mar2021 and had headaches after her second vaccine until the middle of Mar2021 and then her headaches went away. When probing height and weight she reported that, her height has gone down due to age. She reported that, she has lost about 8 lbs. but has regained 2 lbs. in the last week. She's been down to 120 lbs. She's eating crazy things to gain weight, things she didn't normally eat. She reports she weighs 122.6 lbs. but she weighed herself with sweat pants and sweat shirt on so her weight is probably 122.1 lbs. She reported that, she was still weak and when she was out shopping she feels like she was looking for a place lay down onto something. She didn't know whether it's from the Covid 19 vaccine. It's been going on since the end of Mar2021. She reported that, the whole thing to Pfizer Drug Safety from beginning to end last Tuesday, 13Apr2021. The reporter stated that, she has been to the doctor twice. Stated that, on 15Mar2021, she has lost her appetite and lost 8 pounds and she was having a hard time eating. Stated that, she used to enjoy breakfast and lunch but now she was forcing them down. Stated that, sometimes she can eat dinner. Stated that again, she has been to the doctor and he gave her a B12 shot and said if she didn't improve, to come back. The reporter asked whether anyone else has had this reaction. The reporter stated that, she kept taking Tylenol after her headache was gone another 2 days because her temperature would go from 97.1 to 99. Stated that, no fever now. Stated that, the highest it got was 99.8 and as soon as she took Tylenol, her temperature would go down. The reporter clarified that, she very rarely feels like eating anything. She forced herself to eat because she knows she has to. She was not losing anymore weight but she was not putting any back on like she thinks she should be either. Stated that, she took Tylenol, B12 shot but didn't help, NDC, Lot, Expiration was unknown. Stated that, she has to do something, she has to find out whether this was a side effect of the Covid 19 vaccine. Stated that, she has been to the doctor twice and her doctor didn't know what's going on. Stated that, she might have to go to the doctor a third time. She reported that, this vaccine was something new and no one really knows how everyone was reacting to it. Stated that, the first vaccine dose received on 11Feb2021, LOT: EL9269. Second vaccine received on 03Mar2021, Lot: EN6198. First Covid 19 vaccine information is in the suspect product field. Stated that, she hasn't had any other new medications and nothing has changed. The AE(s) did not require a visit to the emergency room. The patient visited physician office twice and the first time was on 10Mar2021. Therapeutic measures included Tylenol, B12 shot were taken for all the events. The patient underwent lab tests and procedures which included body temperature, resulted as elevation, would go from 97.1 to 99. Stated that, no fever now, the highest it got was 99.8 and weight, resulted as decreased, lost 8 pounds. The outcome of the events for weight loss and lack of appetite was not recovered and for fever was recovered on an unspecified date in 2021, for temperature was unknown and headache was recovered on 14Mar2021.  No follow-up attempts possible. No further information expected.