experiencing low blood sugars/In fact my thyroid went severely low was only at .084; In fact my thyroid went severely low was only at .084; having trouble concentrating; sore arm; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non-HCP) from medical information team, Program ID: (005570). The reporter is the patient.  A 50-year-old female patient received BNT162b2 (BNT162B2), on 06Apr2022 as dose 4, single (Lot number: FK9895) at the age of 50 years, in left arm for covid-19 immunisation. The patient's relevant medical history included: "Hypothyroidism" (unspecified if ongoing); "type 1 diabetes" (unspecified if ongoing), notes: type 1 diabetes diagnosed around age 30. States it will be 21 years this September; "painful bladder syndrome" (unspecified if ongoing), notes: painful bladder syndrome diagnosed about 1.5 -2 years ago.; "fibromyalgia", start date: 2015 (unspecified if ongoing), notes: Fibromyalgia she thinks diagnosed in 2015; "COVID-19" (unspecified if ongoing). Concomitant medication(s) included: LEVOTHYROXINE taken for hypothyroidism. Vaccination history included: BNT162b2 (Dose 1, Date: 18Mar2021, lot: ER2613), administration date: 18Mar2021, for COVID-19 Immunization, reaction(s): "blood sugars occurred after the first, second, and third doses of the vaccines"; BNT162b2 (Dose 2, Date: 09Apr2021, lot: EW0162), administration date: 09Apr2021, for COVID-19 Immunization, reaction(s): "blood sugars occurred after the first, second, and third doses of the vaccines"; BNT162b2 (Dose 3, Date: 11Oct2021, lot: FF2589), administration date: 11Oct2021, for COVID-19 Immunization, reaction(s): "blood sugars occurred after the first, second, and third doses of the vaccines"; Flu vaccine; Pneumonia shot. The following information was reported: BLOOD GLUCOSE DECREASED (medically significant), outcome "unknown", described as "experiencing low blood sugars/In fact my thyroid went severely low was only at .084"; THYROID HORMONES DECREASED (medically significant), outcome "unknown", described as "In fact my thyroid went severely low was only at .084"; DISTURBANCE IN ATTENTION (non-serious), outcome "unknown", described as "having trouble concentrating"; PAIN IN EXTREMITY (non-serious), outcome "unknown", described as "sore arm". The patient underwent the following laboratory tests and procedures: Blood glucose fluctuation: 50; 60; 40; 73; Hypothyroidism: 0.084, notes: States she has hypothyroidism that started after the vaccine, just caught it like couple months ago. Her number was .084; Low, notes: caught the severe low recently.  Additional information: Caller shared that she is "very good at controlling her diabetes" and that drops in her blood sugars occurred after the first, second, and third doses of the vaccines. Caller reported that after the fourth dose of the vaccine "it happened a lot faster". Caller said she is in communication with her diabetes specialist and that she always has some sugar with her whether it is food or drink. I am writing you because the Pfizer covid vaccination and booster shots is what I chose and stuck with for all 4 shots. I have been trying to reach out thru research and thru my doctors because of the effects the vaccine is having on me. I am a type 1 diabetic, when I got the 1st shot, I had some highs but not bad, then sever uncontrollable and unannounced lows that lasted days, 2nd dose, and booster were worse with lows this last booster even worse lows. Is anyone else having this. Customer verbatim: I am writing you because the Pfizer covid vaccination and booster shots is what I chose and stuck with for all 4 shots. I have been trying to reach out thru research and thru my doctors because of the effects the vaccine is having on me. I am a type 1 diabetic, when I got the 1st shot, I had some highs but not bad, then sever uncontrollable and unannounced lows that lasted days, 2nd dose, and booster were worse with lows this last booster even worse lows. Is anyone else having this. Caller relays she has already had 2 lows this morning and was up all night in the 50's and 60's and could not get them above 70 for a very long time. States she feels like she is ok now. States the night before she spent 2 hours at 40 and then was able to sleep for an hour and then it crashed down again. It was just all night long and she got maybe an hour and a half of sleep and that was it. States then it crashed again this morning. States it was 73 and had an arrow down meaning it was going down fast. States sore arm states she got the pneumonia shot before covid hit and waited until later for the second. Caller does not recall the name of the tetanus shot but she for sure did it in her other arm, right arm. Caller does not have ndc, lot or expiry to provide. I have sent an email concerning my lows after each covid vaccination (4) my lows have been in the 30-40 randomly day and night. Last night I fought my lows for 2 hours I could not get them to go above 40. Has anyone else with type 1 diabetes said anything. I want to know if I am the only one, please. My dr is not listening to me when I try to talk about it. In fact, my thyroid went severely low was only at .084. I am not complaining at all I just am hoping for answers. I am writing you because the Pfizer covid vaccination and booster shots is what I chose and stuck with for all 4 shots. I have been trying to reach out thru research and thru my doctors because of the effects the vaccine is having on me. I am a type 1 diabetic, when I got the 1st shot, I had some highs but not bad, then sever uncontrollable and unannounced lows that lasted days, 2nd dose, and booster were worse with lows this last booster even worse lows. Is anyone else having this.  No follow-up attempts are possible. No further information is expected.  Follow-up attempts are completed. No further information is expected.