Could have died with a blood pressure with these numbers; Blood pressure had spiked up to 235/104; This is a spontaneous report from a contactable consumer. A 67-year-old female patient received the first dose of the bnt162b2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE; Lot Number: EN9581), via an unspecified route of administration in the left arm on 09Feb2021 at 13:00 at 67-years-old at a single dose for COVID-19 immunization. There were no additional vaccines administered on the same date of Pfizer suspect. The patient did not receive any prior vaccinations within 4 weeks of the Pfizer suspect vaccine. Medical history included blood pressure increased (BP raised) in Sep2020 (BP reading was 135/80).  There were no concomitant medications. The patient experienced: "could have died with a blood pressure with these numbers" (medically significant, life threatening) on an unspecified date, and blood pressure had spiked up to 235/104 (medically significant, life threatening) on 11Feb2021 at 16:30. The clinical course was reported as follows: The patient reported that she was a healthy person; and she had never had blood pressure problems before (as reported). The patient also reported that she was "on no medications whatsoever." Five months ago (from the time of the report), the patient had a wellness exam. The patient's "blood pressure was perfect." It was reported that "everything was perfect" with her health exam five months ago. Five months prior, the patient's BP reading was 135/80. The patient thought that the COVID vaccine was very dangerous and she was unaware that hypertension could even be a side effect. The patient received the vaccine on 09Feb2021, and she "got a long fine while waiting at the facility." Two days later, on 11Feb2021, the patient took her blood pressure and she could not believe the reading. The patient then went to a pharmacy and had the pharmacist take it for her because she thought "she was crazy"; and because she thought her machine was not right. The patient's blood pressure had spiked up to 235/104. When the pharmacist took her blood pressure, they told her she needed to go to the ER immediately. The patient was informed her blood pressure was beyond stroke level; therefore, she was rushed to the ER and was given IV BP medications to try and get her blood pressure down. The patient was released to home. The patient, after she went to the ER the first time, she was told to go see her primary care the following day. Two days later she was back in the ER with spiked blood pressure on 13Feb2021. The patient's blood pressure on 13Feb2021 was 224/84. The patient was again treated and released.   The patient stated that she saw who she believed was a physician assistant (PA). The patient was started on a blood pressure medication as well; and her last and most recent blood pressure reading was 144/85. The patient reported that the she was prescribed hydrochlorothiazide. After the patient's first ER visit, she was prescribed 12.5mg once a day. However, after the second ER visit, she had a blood pressure spike and the dose was increased to 25mg once a day.  The patient received the paper with side effects, and she had none of the side effects listed; "none, whatsoever." The patient read that the more severe side effects were difficulty breathing, fast heartbeat, rash, dizziness. The patient further stated that "under that, it was list serious and unexpected side effects may occur"; this was where the patient felt like her situation come in. It was serious and unexpected. The patient reported that she was upset; and felt that she could have died with a blood pressure of those numbers. The patient reported that she was a healthy person and she was looking forward to getting the vaccine. The patient stated she would not be getting the second vaccine. The patient wished she just had the normal listed side effects such as arm soreness, joint pain, fever, headache; however, she did not experience any of those events. The patient felt that if she did not check her blood pressure at home on her own, she would not have known her blood pressure was that high. The patient then added she had spoken to a couple of doctors and they had a total of five cases that were very similar to hers and had to be treated. The patient underwent lab tests and procedures which included blood pressure: spike on an unspecified date, blood pressure: 135/80 in Sep2020, blood pressure: 235/104 on 11Feb2021, blood pressure: 224/84 on 13Feb2021, blood pressure: 144/85 in Feb2021, health exam: everything was perfect on an unspecified date. Therapeutic measures were taken as a result of the events. The clinical outcome of the events was unknown. Adverse events following prior vaccinations: None. The patient did not remember getting any other vaccinations.