puffy eyes; so tired; mouth hurt; didn't sleep well; She was also shaky yesterday prior to dinner since she had not eaten a lot earlier that day; potential low blood sugar; lower back pain; This is a spontaneous report received from a contactable reporter (Other HCP-Nurse).  An adult patient received bnt162b2 (BNT162B2) (Batch/Lot number: unknown) as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "motion sickness" (unspecified if ongoing); "hurt ankle" (unspecified if ongoing); "sports injury from exercise" (unspecified if ongoing), notes: sports injury from exercise, has not gone to the doctor for it, at least a couple months old by now. The patient took concomitant medications. Vaccination history included: Bnt162b2 (Dose Number: 1, Batch/Lot No: Unknown. Not available/provided to reporter at the time of report completion), for COVID-19 immunization, reaction(s): "potentially fatigue/fever", "potentially fatigue/fever"; Bnt162b2 (Dose Number: 2, Batch/Lot No: Unknown. Not available/provided to reporter at the time of report completion), administration date: 2021, for COVID-19 immunization, reaction(s): "potentially fatigue/fever", "potentially fatigue/fever". The following information was reported: TREMOR (non-serious) with onset 21Jan2022, outcome "unknown", described as "She was also shaky yesterday prior to dinner since she had not eaten a lot earlier that day"; BLOOD GLUCOSE DECREASED (non-serious) with onset 21Jan2022, outcome "unknown", described as "potential low blood sugar"; BACK PAIN (non-serious) with onset Jan2022, outcome "unknown", described as "lower back pain"; PERIORBITAL SWELLING (non-serious) with onset 03Feb2022, outcome "unknown", described as "puffy eyes"; FATIGUE (non-serious) with onset Feb2022, outcome "unknown", described as "so tired"; ORAL PAIN (non-serious) with onset Feb2022, outcome "unknown", described as "mouth hurt"; POOR QUALITY SLEEP (non-serious) with onset Feb2022, outcome "unknown", described as "didn't sleep well". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: Known allergies were unsure. Other medical history: motion sickness, hurt ankle (see previous AER for this), unsure if wears contact lenses. The patient receiving any other vaccines within 4 weeks prior to the COVID vaccine was Unknown. List of any other medications the patient received within 2 weeks of vaccination: unsure - potentially birth control but cannot confirm for sure. The patient was not diagnosed with COVID-19 prior to vaccination. The patient has been tested for COVID-19 since the vaccination. Covid test post vaccination: Covid test name post vaccination: Believe has tested multiple times, with negative result (rapid and PCR at least early 2021. Adverse event: pt. said yesterday something along the lines of the booster shot "kicked her butt". She was also shaky yesterday prior to dinner since she had not eaten a lot earlier that day -believe potential low blood sugar. She has mentioned that her co-workers tell her that she complains of lower back pain. Separate from details above - the reporter had heard from someone prior to my time at Pfizer that she experienced worse side effects from the first shot than from the second vaccine shot. The reporter cannot remember exactly what the effects were - potentially fatigue/fever. The reporter was uncertain how the awareness date for this detail should be logged, as reporter was told before reporter started at Pfizer. There have been other AE reports for pt previously - nausea from believed food poisoning, motion sickness, issue from missing birth control medication, etc. The reporter did not have each AE number logged. Individual that has ankle injury, 24 YO, female; 2-dose vaccinated probably early 2021 (Pfizer) Was a sports injury from exercise, has not gone to the doctor for it, at least a couple months old by now. Most AEs relating to pt. can be tied back from a nurse source. I am unsure if that has been indicated previously, but they should be updated if not. Believe as of awareness 02Feb that booster received was Pfizer. Also mentioned back pain as of awareness 02Feb. Individual stated had puffy eyes when woke early in the morning on 03Feb because was so tired. Towards evening 5/6 pm, said thought had low blood sugar because needed to eat. Expressed that mouth hurt while eating dinner - believes wisdom tooth in top right coming in. May have also said didn't sleep well - but the reporter cannot remember. The reporter assessed events as non-serious with no seriousness criteria of resulting in death, Life threatening, Caused/prolonged hospitalization, Disabling/Incapacitating, Congenital anomaly/birth defect.   No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.