checked Blood pressure it was 210/ something; Felt faint, lightheaded, like he was going to faint/Really dizzy; very weak; challenge walking long distances; This is a spontaneous report from a contactable consumer. A 70-years-old male patient received third dose of bnt162b2 (COMIRNATY, solution for injection, Batch/Lot number was not reported) via an unspecified route of administration on unknown shoulder (age at vaccination was 70-years-old) on 06Oct2021 at 12:00 as DOSE 3 (BOOSTER), SINGLE for covid-19 immunisation. Medical history included hypertension from 2011 and ongoing. Concomitant medication included losartan potassium (LOSARTAN POTASSIUM) taken for hypertension from 2011 and ongoing. Patient historical vaccine included first dose of COMIRNATY on Feb2021 and second dose of COMIRNATY on unknown other than what caller thinks was in Feb2021, about 2 weeks after first dose (Feb2021). On 09Oct2021 Starting around 02:00-03:00, the patient experienced checked blood pressure it was 210/ something (hypertension), felt faint, lightheaded, like he was going to faint/really dizzy (dizziness), very weak (asthenia) and challenge walking long distances. Patient had the first two Pfizer COVID-19 vaccines and had no reactions to any vaccine in his history and as well with the two doses no issues, he received his third dose of the Pfizer COVID-19 vaccine and about 3 days after the third dose he woke up in the middle of night to go to the bathroom felt like he was going to faint, and all day the next day felt very faint and very weak, checked Blood pressure it was 210/ something, too him to the hospital at night and had blood work done, nothing going on no stroke, and he was released. He takes a blood pressure medication to begin with he has had that for about 10 or 15 years and that keeps him very steady. And since that time of the hospital he has continued to have really high blood pressure anywhere from 190-180/90-100, it's been fluctuating up and down but has continued to have a lot of lightheadedness, feeling like he might faint, challenge walking long distances and the blood pressure is still really high. So he is cornered about what is taking place, if there are any recommended tests or anything they can be doing, he has been in touch with his Primary care physician but wanted to report it back to Pfizer because it all seemed very sequential after receiving the vaccine. At initial onset of these events his blood pressure was like 210 over a very high number. He was admitted to the hospital in the emergency room on 09Oct2021 for all of these events. He was seen by the emergency room doctor. They performed blood tests to see if there were any signs of a stroke, but there wasn't anything they could see on the blood work to indicate a stroke, no notable results from the blood test. He was discharged home that same date on 09Oct2021. His blood pressure remains very high since onset, bouncing between like 190/120 and 150/90; last blood pressure taken was 170/110. All events reported by caller as remaining persistent since onset. His blood pressure has been up and down but all the while still high. It was very, very high on 09Oct2021 and 10Oct2021 and kind of just continued to go up and down since then. The outcome of the event hypertension and dizziness was not recovered and unknown for remaining events.  The lot number for the vaccine, [BNT162B2], was not provided and will be requested during follow up.