chills; fever; received a third dose/booster today; received a third dose/booster today; headache; This is a spontaneous report from a contactable consumer (patient). A 69-year-old female patient received third dose of BNT162B2 (COMIRNATY, Solution for injection, Batch/Lot Number was not reported) via an unspecified route of administration on 08Sep2021 as dose 3, single (age at vaccination: 69-year-old) for COVID-19 immunisation. Medical history included thrombocytopenia, High cholesterol, High blood pressure, Low platelet count from an unknown date and unknown if ongoing. The patient's concomitant medications were not reported. The patient previously took first dose (on an unspecified date) and second dose of BNT162B2 on an unspecified date in Feb2021, both for COVID-19 immunisation. On 08Sep2021, the patient received a third dose/booster today (off label use, extra dose administered). Additional information included patient received both doses of database, second in Feb2021, just received a third dose/booster today and was told the booster will be made of a different component that she received today. Caller states that she has thrombocytopenia, and her hematologist told her a month ago that she could get the booster any time, so she went to the pharmacy today and asking if booster is the same as a third shot and if they are of the same formulation. Did not probe as to any other medical conditions that would have deemed her immunocompromised and did not realize until after call ended that she may not have qualified for the third dose. Consumer stated, Yes. I have high blood pressure, high Cholesterol. I have low platelet count and that's the reason, I went for the third shot, because my immunologist told me, Because I am very sick and because my immune system is stimulated. I don't know, doesn't make any sense and I have a reaction to it after the second shot. I was having the same symptoms, A headache, Fever, Chills and then fever the next day, on a way came back at night on a way, the next day was fine. I have been fine all day today, Except I had a little fever. That's why I called. I don't know. It it's normal for Pfizer, A normal reaction after taking Pfizer and having it for 2 days. Consumer stated, "That's all I take. So, The day after the shot yesterday. No. Wednesday after the shot, I got a headache so, I took some Aceterin you know after they works. So, In mid of the night, yesterday. 2'o clock in the morning, I got the chills so, I took my temperature so, it was normal like 97 and okay so, I took Tylenol to get rid of the chills, that worked, and I went back to sleep and then in the morning, I find my blood pressure, Tired and I sat on the couch for all other day. My temperature was like 99. Is that a 100, 100 point something, then it went up to 101 and I was like okay so, I took 2 Tylenol. It did nothing. It didn't take the fever gone. It didn't take away the headache. I said okay and I took two Ibuprofen and then that seems to help. So, if you want to know, I was fine. I was fine all day. All last evening, No headache, No fever, Nothing. I get up this morning and I took temperature just for fun. It was 99.2 and I was like, how that's so, I just, it took a couple kind of day and it stays around 99 and then it went up to 100 and I am like, why is this going up. Or why is it up. This is just 2 days since the shot so, that's why I was calling to find out, If that's the normal reaction to Pfizer. Caller states I got a third shot that I needed because I have an autoimmune disease. I got it Wednesday (08Sep) in the morning and by the evening I had a headache. I took an Excedrin and went to bed then at 2 in the morning I had chills. The scanner thermometer said I didn't have a fever, but I think I did. I took 2 Tylenol then and then at 10 in the morning, still feeling like garbage I took 2 more Tylenol and then at 12:30 in the afternoon I still got a fever of 101F and a headache then the Tylenol never touched it. So, I took 2 ibuprofen and that seemed to bring it right down I was good the rest of the day, all day yesterday I was good even into the evening. With my second shot I had the same exact symptoms I ended up with a fever later that night which would have been last night, but last night I did not but today I got up and had a 99.2F which I know is technically not a fever but that's not normal for me and this afternoon it's been up around 100F so I don't understand, that's 2 days now. I went out and I ran some errands. Ibuprofen seemed to help and like I said I ran some errands, and I was okay most of the night I checked my temperature it was back to normal 97 something I went yeah okay I'm over this. My hematologist told me because I have a low platelet count that when I get my third dose, I could be sicker than I was with the second and I said oh delightful, so I don't know if that's maybe why it's taken me 2 days to recover. I just wanted to make sure this is normal. I tried calling her, but she's on vacation and she never calls me back, so I figured I'd call you to see if this is normal. The patient received treatment with Tylenol, Aceterin, Ibuprofen. The patient underwent lab tests and procedures which included blood cholesterol: high, blood pressure measurement: high, body temperature: 97 fahrenheit normal, body temperature: 99 fahrenheit, body temperature: 100, 100 point something fahrenheit, body temperature: 101 fahrenheit, body temperature: 99.2 fahrenheit, platelet count: low on an unspecified date. Therapeutic measures were taken as a result of headache (headache), chills (chills), fever (pyrexia). The outcome of the events Chills, headache, Fever was recovered and outcome for other events was unknown. The lot number for the vaccine BNT162B2, was not provided and will be requested during follow up.  Follow-up (10Sep2021): New information received from a contactable consumer. This consumer (patient) reported that: Relevant medical history and Lab test (High cholesterol, High blood pressure, Low platelet count, body temperature), New events (Booster, Chills, headache, Fever).  The lot number for the vaccine, [BNT162B2], was not provided and will be requested during follow-up.