could not raise her arm or do exercises; could not raise her arm or do exercises; chills; fatigue; aches; very little energy; got sicker; have pain in her left arm at the injection site; Left arm hurts; This is a spontaneous report from a contactable consumer. A 76-year-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE), dose 3 via an unspecified route of administration, administered in the left arm on 06Oct2021 at 11:30 (Batch/Lot Number: 301558A; NDC number and Expiration Date: Unknown) at 76-years-old as DOSE 3 (BOOSTER), SINGLE for COVID-19 immunisation.  The patient did not receive any other vaccine within four weeks of the suspect vaccine or additional vaccines administered on same date of the Pfizer suspect. The patient's medical history was reported as none. There was no family medical history relevant to the adverse events (AEs). There were no concomitant medications.  The patient previously received bnt162b2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE) DOSE 1 (Lot Number: EL3247; Expiration: unknown, Anatomical location: Right arm) on 22Jan2021, and then DOSE 2 (Lot: EM9810; Expiration: unknown Anatomical location: Left arm) on 12Feb2021; both at 76-years-old for COVID-19 immunization and she did not have trouble with the first two doses. There were no AEs following prior vaccinations: " she does not get vaccines." On 07Oct2021, the patient experienced: have pain in her left arm at the injection site (non-serious), and left arm hurts (non-serious). On 08Oct2021, the patient experienced: could not raise her arm or do exercises (medically significant), chills (non-serious), fatigue (non-serious), aches (non-serious), very little energy (non-serious), got sicker (non-serious). There was no emergency room or physician office visits. The clinical course was reported as follows: The patient reported that she only saw her health care professional (HCP) once a year and she was in good health. The patient was a 76-year-old female who received the booster dose of the Pfizer COVID-19 vaccine on 06Oct2021 and on 07Oct2021 started to have pain in her left arm at the injection site. The patient reported that the rest of the side effects started the next day on 08Oct2021, stating she got sicker.  The patient also reported that on 08Oct2021 that she started to have complaints of chills, fatigue, and aches. The patient was still having lingering side effects. The patient was still having all these complaints and could not raise her arm or do exercises; however, she was able to when she took ibuprofen on 14Oct2021 at 10:00 her time. The patient reported that unless she takes ibuprofen, she could not make it through the day. The patient also reported that the ibuprofen was not working as well. The patient experienced left arm pain where she got the shot and that it still hurt, chills, very little energy, fatigue, and aches all over. The patient reported that there was something else, but she could not remember. Until she took ibuprofen, she did not feel like going through the day and she had a lot to do. The events had been going on the past the seven days since she got the booster. The patient did not have trouble with the first two doses. There were no relevant tests performed. Therapeutic measures were taken as a result of could not raise her arm or do exercises, have pain in her left arm at the injection site, left arm hurts, chills, fatigue, aches, very little energy, and got sicker. The clinical outcome of the events was not recovered; further stating "it was in between the same (persisting) and worsened, each day it was different, but all symptoms are ongoing."  Follow-up attempts have been completed and no further information is expected.