My temperature, it is 100.6; I was feeling chills; I am having body aches/full blown body aches; I was starting to feel achiness/achiness was not going away; I am congested all of a sudden; I felt like I was developing a headache that just got worse as the day progressed/now I woke up this morning and my head is hurting; I was not feeling well; This is a spontaneous report from a contactable nurse who reported for herself. A 56-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE; Lot #: EH9899; Expiry Date: Mar2021) via an unspecified route of administration on 18Dec2020 at 09:59 (at the age of 56-years-old) as a single dose for COVID-19 vaccination. Medical history was reported as none. The patient reported "no, I do not have any health issues." Concomitant medications included estradiol taken as hormone therapy from an unspecified date at 0.1 mg, once daily. The patient experienced "I felt like I was developing a headache that just got worse as the day progressed/now I woke up this morning and my head is hurting" and "I was not feeling well" on 18Dec2020, "I was starting to feel achiness/achiness was not going away" on 18Dec2020 at 18:00, "I was feeling chills" and "I am having body aches/full blown body aches" on 18Dec2020 at 19:00, "I am congested all of a sudden" on 18Dec2020 and "my temperature, it is 100.6" on 19Dec2020. It was reported that the "symptomatology began immediately after I got the vaccine (COVID Vaccine)". The clinical course was reported as follows: "I received a vaccine (COVID Vaccine) at work. I am a nurse, I received a vaccine at 09:59 today morning and within probably 5 or 10 minutes, I felt like I was developing a headache that just got worse as the day progressed. By the time, I got home, I get off at 6 O'clock, I started to feel achiness and then eventually I was feeling chills and I was congested all of a sudden as well. So, I took a 1000 mg of acetaminophen last night probably around 9 PM. Initially, I thought it was just side effects from the shot and I would ride it out, but the achiness was not going away. So, I took the acetaminophen and went to bed. When I took the acetaminophen within about two hours the symptoms improved, the achiness had diminished, but I woke up this morning and my head was hurting, I am having chills, I am having body aches. I just took my temperature, it was 100.6." The nurse stated that she took acetaminophen as treatment for the side effects. When asked about the primary/prescribing Healthcare Professional details the patient stated "well, it was not a doctor it was a nurse at our hospital, it was a room full of people giving the shot." The patient also stated "I read correctly under side effects that the vaccine cannot cause you to contract COVID. Is that true?" The nurse was informed about Pfizer Medical Information department. When asked about the dosage, the patient stated "No, I don't think that is on here." When asked about the causality, the patient stated "I think it is possible, but it is also possible I mean I just got the vaccine yesterday, I mean we test patients for COVID in my department. My department is responsible for testing all procedures on surgical patients at the hospital and there is always a chance that I have contact with COVID but it is odd that the symptomatology began immediately after I got the vaccine (COVID vaccine), I mean within 10 minutes, I was not feeling well. When I woke up yesterday I was having no symptoms whatsoever and then almost immediately after I took the vaccine it seemed that I had a headache again and it just lasted the entire day, all day until I got home it was so bad and I still have not taken anything because I thought it was just the side effects and like 7 O'clock I was having full blown body aches and chills." (as reported). The clinical outcome of the event "I felt like I was developing a headache that just got worse as the day progressed/now I woke up this morning and my head is hurting" was not recovered/not resolved; the outcome of the event "I was starting to feel achiness/achiness was not going away" was recovering/resolving; while the outcomes of the events "I was feeling chills", "I am congested all of a sudden", "my temperature, it is 100.6", "I was not feeling well" and "I am having body aches/full blown body aches" were all unknown.