her blood pressure went lower/Very low blood pressure in her left arm went down some more; Just did not feel good; Felt like she had a little bit of the flu or something for several days; her blood pressure in both arms also shot; Heart rate shot up to like 100 something; This is a spontaneous report from a contactable consumer (patient). An 87-year-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Batch/Lot number: Unknown, Expiration date: unknown), dose 1 via an unspecified route of administration on 08Feb2021 (at the age of 87-year-old) as dose 1, single for COVID-19 immunization. Medical history included blood pressure was low from an unknown date and unknown if ongoing. The patient's concomitant medications were not reported. The patient previously received flu shot for immunization and experienced flu. Patient stated she received the first dose of Pfizer's COVID vaccine on 08Feb2021 and was due for her second dose on Monday, 01Mar2021. She stated her blood pressure was low before the first dose, but after receiving the first dose, her blood pressure went lower (2021). It is dangerously low now and she was wondering if she should receive the second dose. Patient again stated after he had the first dose on 08Feb2021, and her blood pressure dropped. So, it was low before he had the vaccine, but it went lower after she received the first dose of the vaccine. Patient again stated I have not had the second shot yet. I am afraid to get the second shot because my blood pressure and I was already been doctoring for my low blood pressure in my left arm and my right arm was high, but my left arm reached a very low. But it got lower after I took the shot, then it got lower, dangerously low. So, I was afraid to get the second shot. I was wondered if I go ahead and got it because it was coming up Monday and I was afraid to do it, my blood pressure even might go lower as it was persistently low. Patient stated for treatment, No, I had an appointment to go, have an ultrasound tomorrow. For the lab work patient stated not yet. Reporter again stated after administered her first dose she just did not feel good (2021); she felt like she used to feel after she got the flu shot, like she had a little bit of the flu or something for several days (2021); but she was still having problems. She was seeing a doctor because of an existing problem with very low blood pressure in her left arm. The blood pressure in her left arm has about a 50-point differential as compared to the blood pressure in her right arm. The Blood pressure in her right arm was higher than in the left arm. Because of the blood pressure issue and shoulder issue she was having an ultrasound performed tomorrow, 26Feb2021. She reported that the top number in her blood pressure of left arm was bad, but the bottom numbers are ok; the top number goes down below 100 sometimes. She reported that her very low blood pressure in her left arm went down some more after she was administered the first dose. Due to that event, she was very nervous about getting the second dose of the Pfizer COVID-19 Vaccine. She was scheduled for the second dose of the Pfizer COVID-19 Vaccine on Monday, 01Mar2021. She reported that after she was administered the first dose her blood pressure in both arms also shot up and her heart rate shot up to like 100 something a couple of times (2021). She had not had a problem with her heart rate in many years before this event. The blood pressure shot up and heart rate shot up events did not last; it was just for a couple of days but left her a little concerned. She looked on the internet, did a lot of researching and talked a lot to (clinic name withheld); she looked up their whatever they had; and asked some questions about the vaccine. One of the things it said on there was when you have low blood pressure; and she also had dermatitis bad on areas of her body; but if you have the first shot they have found that would suffice if you have a reaction or worry about the low blood pressure; and they said the vaccine does lower blood pressure; then you may not had to get the second dose of the vaccine as the first dose may provide sufficient effect. She asked if it was ok to only at the first dose of the Pfizer COVID-19 Vaccine if you had a reaction with the first dose. There was no treatment for the events. The patient underwent lab tests and procedures which included blood pressure: went lower (the top number in her blood pressure of left arm is bad, but the bottom numbers are ok; the top number goes down below 100 sometimes), blood pressure: her blood pressure in both arms also shot, heart rate: shot up to like 100 on an unspecified date in 2021. The clinical outcome of events was unknown. No follow-up attempts are possible; information about lot/batch number cannot be obtained.