weak; his left leg bothers him and won't keep up with his right leg.; Lost a lot of weight; he was getting worn out; he was losing his breath.; has got him wobbly; flu shot in the other arm; flu shot in the other arm; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  An 89-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 30Nov2022 as dose 4 (booster), single (Lot number: GJ3276) at the age of 89 years, in left arm for covid-19 immunisation; influenza vaccine (FLU [INFLUENZA VACCINE]), on 30Nov2022 as dose number unknown, single (Batch/Lot number: unknown), in arm for immunisation. The patient's relevant medical history included: "Lung disease" (ongoing), notes: COPD. Has it bad. Was diagnosed around 1987-1988.; "Lung cancer" (unspecified if ongoing), notes: took 6 wks of radiation (radn) to get rid. This yr took the radn. Finished radn abt 4-5 mnths ago; "radiation" (unspecified if ongoing), notes: frm nerves in back, can't operate cz of age, COPD. lung cancer, had 6 wks of radn, got it all out. There were no concomitant medications. Vaccination history included: BNT162b2 (Dose 1, Single, Lot: 30145BA, Expiry date: Nov2021, Site:  Thinks it was the left arm.), administration date: 11Feb2021, when the patient was 87-year-old, for Covid-19 immunization; BNT162b2 (Dose 2, Single, Lot: EL9266, Expiry Date: May2021, Site: Left arm), administration date: 02Mar2021, when the patient was 87-year-old, for Covid-19 immunization; Bnt162b2 (Dose 3, Single, Date: Oct2021, Lot: EN6205, Expired Nov2021, Site: Thinks it is the left arm.), administration date: Oct2021, when the patient was 87 years old, for Covid-19 immunization. The following information was reported: OFF LABEL USE (non-serious), PRODUCT USE ISSUE (non-serious) all with onset 30Nov2022, outcome "unknown" and all described as "flu shot in the other arm"; NERVOUSNESS (non-serious) with onset 02Dec2022, outcome "not recovered", described as "has got him wobbly"; ASTHENIA (non-serious), outcome "unknown", described as "weak"; LIMB DISCOMFORT (non-serious), outcome "unknown", described as "his left leg bothers him and won't keep up with his right leg."; WEIGHT DECREASED (non-serious), outcome "unknown", described as "Lost a lot of weight"; FATIGUE (non-serious), outcome "unknown", described as "he was getting worn out"; DYSPNOEA (non-serious), outcome "unknown", described as "he was losing his breath.". Relevant laboratory tests and procedures are available in the appropriate section.  Additional Information:Caller was a consumer that was calling about the Booster shot he got yesterday and reported that it had got him wobbly, and the other shots did not do this to him. He took a flu shot in the other arm. It had him wobbly and shook up today. He was given the vaccines around 3:30-4pm yesterday. He clarified that he was weak, wobbles anyway, his left leg bothers him and won't keep up with his right leg. It was from the nerves in his back, but they can't operate because of his age and he had a lung disease, COPD. He had lung cancer and had 6 weeks of radiation and they said it got it all out. His symptoms started at around 08:30 this morning when he got up. If he sits still, it gets better, but if he walks around he feels weak. Unsure if it was the shot or not. Outcome of the event was persisting but comes and goes and if he moves around a lot it gets worse, because he was weak. Supplemental form not queried as caller said that he was getting worn out and that he was losing his breath. There was a product complaint to report.  Description of complaint: the Booster shot he got yesterday and reported that it had got him wobbly, and the other shots did not do this to him.