fever/running a temperature of 100.5 degrees today/her temperature was back up 100.1 degrees; This morning she was real chilly before she had left the house. She said she was chilly again this afternoon, and when she took the Tylenol, her chilliness went away; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 73 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 10Mar2021 09:40 (Lot number: EN6199) at the age of 73 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Type 2 diabetes mellitus" (ongoing); "Blood pressure high" (ongoing); "thyroid problems" (ongoing), notes: verbatim thyroid problem; "Acid reflux (esophageal)" (ongoing); "Fatty liver" (unspecified if ongoing); "heart trouble" (unspecified if ongoing), notes: verbatim heart trouble. The patient took concomitant medications. The following information was reported: BODY TEMPERATURE INCREASED (non-serious) with onset 11Mar2021, outcome "not recovered", described as "fever/running a temperature of 100.5 degrees today/her temperature was back up 100.1 degrees"; FEELING COLD (non-serious) with onset 11Mar2021, outcome "recovering", described as "This morning she was real chilly before she had left the house. She said she was chilly again this afternoon, and when she took the Tylenol, her chilliness went away". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of body temperature increased, feeling cold.  Additional information: Caller states she received the first dose of the Pfizer COVID vaccine on 10Mar2021. Caller states she had a fever and has been chilly. Caller states she has been taking Tylenol for the fever and it will come down and then go back up. Caller would like to know if her side effects are normal and what should she do about them. Events were collected in the electronic diary (e-diary) from Day 1 to Day 7 after each dose. She was running a temperature of 100.5 degrees today. She said she took a Tylenol, and her temperature went down to 99.5 degrees. She said her temperature went back up 100.1 degrees. This morning she was really chilly before she had left the house. She said she was chilly again this afternoon, and when she took the Tylenol, her chilliness went away. Additional Information for Other Conditions: Reported she has had Type 2 Diabetes for 8-9 years. Reported she had high blood pressure for about just as long as Type 2 Diabetes (about 8-9 years). Reported she got sick when she was working at the hospital, clarifying her heart rate went way up. She said she was put on a defibrillator, or something like that, and it took care of her problem. No further details provided. Reported she has had thyroid problems for 4, or more, years. Reported she has had acid reflux for about 9 years. She said she has had fatty liver for about 3 years. Reported she took her first Pfizer COVID-19 Vaccine shot yesterday (10Mar2021) and was running a temperature of 100.5 degrees today (11Mar2021). She said she took a Tylenol, and her temperature went down to 99.5 degrees. She said her temperature was back up 100.1 degrees, and she took another Tylenol. Reported she had gone to her doctor's office today to do lab work for something else, and when she came home, she checked her temperature and saw her temperature was 100.5 degrees. Reported she took 1 generic Acetaminophen 100mg capsule, twice today (11Mar2021). She said she bought the generic Acetaminophen at (Withheld). NDC Number: 69842-484-78 Lot Number: DAE3058A Expiration Date: Nov2021. Reported she had only been taking her regular medications and hadn't taken anything new recently. Reported she had lots of problems; sugar (clarified as Type 2 Diabetes), high blood pressure, heart trouble, thyroid problems, acid reflux, and fatty liver. She said she also takes cholesterol medicine. Reported her blood work she had today was to check for fatty liver, and hepatitis. No further details provided. Caller said she wanted to know why she was having a temperature after getting the COVID-19 Vaccine. Caller said she read after she got her COVID-19 Vaccine that Tylenol shouldn't be taken. Caller was advised she would be transferred to Pfizer Medical Information for further assistance. Reported beside having a temperature, she was chilly, too. She said this morning she was really chilly before she had left the house. She said she was chilly again this afternoon, and when she took the Tylenol, her chilliness went away. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available) was none. Reported she took her first Pfizer COVID-19 Vaccine shot yesterday (10Mar2021) and was running a temperature of 100.5 degrees today (11Mar2021). She said she took a Tylenol, and her temperature went down to 99.5 degrees. She said her temperature was back up 100.1 degrees, and she took another Tylenol. She said beside having a temperature, she was chilly, too. She said this morning she was really chilly before she had left the house. She said she was chilly again this afternoon, and when she took the Tylenol, her chilliness went away. Emergency Room was no. Prior Vaccinations (within 4 weeks) was none.  No follow-up attempts are possible. No further information is expected.