Sick; woke up 12 hours later and had a temp of 102 and arm pain/ temp gotten as high as 103 degrees Fahrenheit; arm pain; sweating; she was really tired; This is a spontaneous report from a contactable nurse. This 49-year-old female nurse reported for herself that she received the first dose of BNT162B2 (Pfizer-BioNTech COVID-19 Vaccine, Lot number: EL8982) at single dose for Vaccination on 14Jan2021. The vaccine was injected to left deltoid/shoulder about 2:15 pm. Relevant medical history included ongoing uterine fibroids since Dec2019, ongoing obesity since Oct2000 and COVID-19 from Dec2020 to Dec2020.   Relevant concomitant drug was unknown. The patient had surgical procedures when she had her first child. No Family Medical History Relevant to AE(s).  Her mother got the shot a couple of days before caller did and she had no problems. The patient was administered her first dose of Pfizer BioNTech COVID-19 Vaccine on 14Jan2021. She reported that she became sick (Medically significant) about 12 hours later on 15Jan2021.  The patient Went to sleep and woke up about 12 hours after she got the Pfizer-BioNTech COVID-19 Vaccine with a body temperature of 102 degrees Fahrenheit and arm pain. She could not really go back to sleep. When she got up it went away. She tried to go to work that day, and did go to work but she was really tired. When she finally got home she got in the bed and really had not been out of bed since then except for today she was sitting in a chair; so she thought maybe she had improved a little bit at on the reporting day. She had maintained a constant fever since 15Jan2021 that had gotten as high as 103 degrees Fahrenheit. At the reporting time her temp was 100.5. She had alternated Tylenol and Motrin for the fever. She was sweating profusely so it may be the temperature trying to break, but she had been struggling since she had it. This was so unlike her, she did not just stay in bed. She could not kick it. She had been unable to work since 15Jan2021 and she had to work tomorrow.  She believed this was medically significant because she cannot work.  The patient did not have vaccinations within four weeks prior to the first administration date of the suspect vaccine(s).  No Additional Vaccines was administered on Same Date of the Pfizer Suspect. Relevant Tests was None. The patient did not visit the emergency Room nor Physician Office due to the events. The outcome of event being sick was resolving. The outcome of event temperature had gotten as high as 103 degrees Fahrenheit was not resolved. The outcome of other events was unknown. The patient thought the causality was yes 100% because her COVID-19 symptoms were not even this bad; she never had a fever with COVID-19; and she had never before had a fever this high for this long.; Sender's Comments: There is a plausible chronological association between vaccine administration and onset of the event; causality therefore cannot be excluded. The impact of this report on the benefit/risk profile of the Pfizer product is evaluated as part of Pfizer procedures for safety evaluation, including the review and analysis of aggregate data for adverse events. Any safety concern identified as part of this review, as well as any appropriate action in response, will be promptly notified to regulatory authorities, Ethics Committees, and Investigators, as appropriate.