They think there is a blood clot in her lung; My blood pressure dropped off to absolutely nothing; all of a sudden it down below 100 then down to in the 50's; I am not on any medication now my blood pressure is rolling good by a far; bad cough; I got the booster shot on August 31 since then all of a sudden my blood pressure dropped off to absolutely nothing; I got the booster shot on August 31 since then all of a sudden my blood pressure dropped off to absolutely nothing; This is a spontaneous report from a contactable consumer (patient). A 79-year-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: Solution for injection, Lot Number: EW0181), via an unspecified route of administration on 31Aug2021 as dose 3, single for COVID-19 immunization (at the age of 79-year-old). Medical history included ongoing high blood pressure, ongoing stage 3 kidney disease and knees replacement from 2009. The patient's concomitant medications were not reported. The patient previously received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: Solution for injection, Lot Number: EL9262), via an unspecified route of administration on 20Jan2021 as dose 1, single for COVID-19 immunization. The patient previously also received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: Solution for injection, Lot Number: EM9809), via an unspecified route of administration on 10Feb2021 as dose 2, single for COVID-19 immunization. The patient stated, "This probably has nothing to do with it but yet again we can't come up with anything else. She had a high blood pressure since she was 35, never changed in all those years and had basically the same medication is forever no problem. She was not on any medication now his blood pressure is rolling good by a far be best for sure. She had blood work had it half a dozen times and electrocardiogram and have another test on Tuesday and we can come up with nothing the only variation in anything that she had done would be the booster shot (COVID-19 vaccine) nothing else. They just wonder if possibly is that how some is connected, she don't know. His blood pressure would, if they doing a lot of stuff for fooling around even with the medication his blood pressure might be 185 over 95, you know probably the time it would run 135-140 down to 89 may be somewhere around like that all of a sudden it down below 100 then down to in the 50's. Received follow up for consumer regarding the third dose, booster of the Pfizer COVID vaccine. She had the booster dose on 31Aug2021. The next day, she did not feel good. From that time on, until 2-3 days ago, she had a bad cough. Within the last week or longer, her blood pressure dropped way down to 93/50. She had high blood pressure since she was 35. She quit taking medication and all that. Today, she is going for CTA test for blood clots. They think there is a blood clot in her lung. She also has to go for another heart test tomorrow and had one last Friday. Right now, they did blood work on Friday and D-Dimer test came back. It should have read 0.80 and instead read 1.83. She does not know if it is related to the vaccine, but something happened extreme. The only thing that happened that was different was the vaccine. Her primary care doctor does not even know it yet. She has been dealing with her cardiologist and nephrologist. She has to leave in 30 min to go for next test and they said they would probably put her in the hospital for next test. She did not know the name of the test that she would be hospitalized for. Her nephrologist paperwork said everything on paper except what test name is. She did not wish to provide names of the doctor's yet until she gets more information and results. She called over the weekend and she spoke with someone in Pfizer Medical Information. She does not have a report number for previous report. She thinks last digit is 1 or could be 7, but is pretty sure it is a 1. The outcome of the events was unknown.  Follow-up attempts are completed. No further information is expected.