the patient had joint pain which was horrible reaction in all the joints throughout her body but worse in left knee; Initial information regarding this unsolicited valid non-serious case received from a consumer (patient) and transmitted to Sanofi on 01-Dec-2020.  This case involved a 76 year old female patient who had joint pain which was horrible reaction in all the joints throughout her body but worse in left knee (arthralgia), while she received vaccine INFLUENZA USP TRIVAL A-B HIGH DOSE SUBVIRION VACCINE [FLUZONE HD].  It was reported that she had been getting flu vaccines for several years and had never had side effects, maybe a little injection site reaction once in a while.  Relevant medical history, concomitant medications and family history were not provided.  At the time of the event, the patient had ongoing arthritis in both knees and left knee was a little bit worse.   On an unknown date in Oct-2018, the patient received a dose of suspect INFLUENZA USP TRIVAL A-B HIGH DOSE SUBVIRION VACCINE (lot number and expiry date not reported) via unknown route in unknown administration site for prophylactic vaccination.  The patient said she had been getting flu vaccines for several years and had never had side effects, maybe a little injection site reaction once in a while. She had reaction Fluzone HD 2018-2019 vaccine. She said back in 2018 pharmacy suggested that she get High Dose as she was 76 year.   On an unknown date, the patient developed a non-serious the patient had joint pain which was horrible reaction in all the joints throughout her body but worse in left knee (arthralgia) 3 days following the administration of INFLUENZA USP TRIVAL A-B HIGH DOSE SUBVIRION VACCINE.   It was reported that the joint pain was horrible reaction in all the joints throughout her body but worse in left knee. She did have slight arthritis in both knees and left knee was a little bit worse. She said this pain in all joints and it was not arthritis pain. It was awful but it did go away in 2 -3 weeks. She said she did not feel well for a little bit but that was probably not from vaccine. The severity of the pain had frightened her. This pain started 3 days after shot. Her bones felt like they were on fire and terrible. She did not have any of the other side effects, no chills, or fever or headache and no injection site reaction, no diarrhea, no nausea.   She experienced joint pain and called the Centers for Disease Control and Prevention (CDC) but they also told her that joint pain was not a side effect but then she found it on Internet. She said then in 2019 her allergist told her never to get a flu vaccine again. She was wanting to talk to her primary care physician (PCP) but then Corona virus started and she was not able to speak to her PCP. She did not get a flu shot in 2019 and this year. Caller said she would definitely never get the HD again, but she did not understand why allergist told her never to get flu vaccine.   Relevant laboratory test was not reported.  Final diagnosis was arthralgia.   It was not reported if the patient received a corrective treatment.  On an unknown date, the patient had recovered from the reported events.  There would be no information available on batch number for this case.