experienced sharp pains in her lower left leg; she got 24/7 twitching in both of her calves; Pfizer Covid booster/Caller clarifies the date was 30Aug2021; Pfizer Covid booster/Caller clarifies the date was 30Aug2021; this could be benign fasiculitis; she thinks one was Lyme; This is a spontaneous report from a contactable consumer (Patient). A 74-years-old female patient received BNT162B2 (PFIZER-BIONTEC COVID-19 mRNA VACCINE, Solution for injection, Batch/lot no: FC3185 and expiry date was not reported), via an unspecified route of administration, administered in Arm right on 30Aug2021 (age at vaccination was 74 years) as DOSE 3 (BOOSTER), SINGLE for COVID-19 immunization at Pharmacy. The patient did not have any medical history (including any illness at time of vaccination) and also did not receive any concomitant medications. Historical vaccines included first dose of BNT162B2 (PFIZER-BIONTEC COVID-19 mRNA VACCINE, Solution for injection, Batch/lot no: EL9264 and expiry date was not reported), via an unspecified route of administration, administered in left arm, on 27Jan2021 as a dose 1, single; second dose of BNT162B2 (PFIZER-BIONTEC COVID-19 mRNA VACCINE, Solution for injection, Batch/lot no: EL9266 and expiry date was not reported), via an unspecified route of administration, administered in left arm, on 18Feb2021 as a dose 2, single for COVID-19 Immunization. The vaccine was not administered at Military Facility. There was no Additional Vaccines administered on Same Date of the Pfizer Suspect. Patient did not receive Prior Vaccinations (within 4 weeks) and there was no AE(s) following prior vaccinations. Reporter stated that shortly after she got the booster, within a week, she experienced sharp pains in her lower left leg for 4 days in a row sporadically for a couple minutes each day and she never had that again after that. Stated that shortly after those pains she got 24/7 twitching in both of her calves and that continued to this day, almost 2 months later. Reporter stated she had seen her GP and also a neurologist and had been tested for all kinds of things, they have done blood, she was going to get an MRI and had nerve testing on her arms and legs. Reporter stated she had never had symptoms before the Covid shot, no accidents or incidents that would bring this on and she was not sure that it was related or not. Reporter provided that those pains occurred when she wasn't even moving, she was sitting on the beach or when she was just walking. Stated there was no special sequence to the circumstance. Reporter stated she has not had the MRI yet, she had had blood for 3 different and they were trying to rule out anything serious that could cause these symptoms. Stated she thought one was Lyme and looking for B vitamins, she doesn't know specifically. Reporter stated she wanted us to know this could be a possible side effect, that none of the doctors would address that possibility. Stated she saw her foot doctor for another related and his eyebrows shot up. Reporter stated she would like to add one more thing, the neurologist, they were in the beginning of testing, thought this could be benign fasiculitis. Reporter stated she doesn't knew if she was pronouncing that right or how to spell it. Stated it was involuntary twitching syndrome that was not curable and they were not sure what brought it on. Stated that medication could bring on onset if in fact that was what this was, stated it's too early to know yet. AE(s) did not require a visit to Emergency Room but required a visit to Physician Office. Outcome of all events this could be benign fasiculitis and she thinks one was Lyme was unknown, for sharp pains in her lower left leg was resolved on an unspecified date in 2021 and for she got 24/7 twitching in both of her calves was not recovered.