loss consciousness; fatigue; I felt like I lost my balance and started to faint; I lost balance and fell; I lost balance and fell; Booster; felt that the weakness was coming; This is a spontaneous report from a contactable consumer or other non-HCP (patient himself) via Medical Information Team. A 62-year-old male patient received BNT162b2 (PFIZER BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Lot number- FE3590) via an unspecified route of administration on 30Oct2021 as dose 3 (booster), single (at the age of 62-years-old) for COVID-19 immunization. Patient had no relevant medical history. The concomitant medications were reported as none. Historical vaccine included first dose of BNT162b2 (PFIZER BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Lot number- EP7534) on 24Mar2021 as dose 1, single and received BNT162b2 (PFIZER BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Lot number- ER8737) on 16Apr2021 as dose 2, single for COVID-19 immunization. The patient had three shots of vaccine, the later was put on yesterday 31Oct2021. The patient lost balance and fall on 31Oct2021. The patient was now travelling and again the patient felt like the patient lost his balance and started to faint on 31Oct2021. The patient had not hit his head but the patient seated when the patient felt that the weakness was coming on an unspecified date in Oct2021. The patient may need her help to find out if this was a secondary effect of the Pfizer Vaccine. It happened before was manageable, now was very strong weakness. Syncope (fainting) may occur in association with administration of injectable vaccines, in particular in adolescents. Procedures should be in place to avoid injury from fainting. The patient experienced fatigue on an unspecified date. There had also been reports of fatigue. However, there was no information regarding reports of losing balance. Pfizer could not assess causality (cannot assess if what you described, are experiencing was associated with the Pfizer BioNTech COVID-19 vaccine. His doctor or healthcare provider was in the best position to assess and advise his as his doctor or healthcare provider was most familiar with his medical condition, clinical history, how his treatment had been conducted and any relevant information to their specific case. The patient was calling from withheld at this time due to traveling there on 31Oct2021, the patient will return. Caller received the Pfizer Covid 19 Booster on Sat 30Oct2021. The patient loss consciousness for a couple of seconds times 2 episodes falling to the floor on 31Oct2021. Today on 01Nov2021, the patient loss of consciousness for a few seconds and was seen in the hospital, but not admitted. He was asking if they symptom may be related to the vaccine. He stated the patient had his first two Pfizer Covid vaccines without any problem and the patient felt very protected and felt very happy. He stated that two days ago, clarified on 30Oct2021, that the patient got his booster shot. Stated the patient got the booster vaccine and then the next day he traveled. Stated that day the patient lost consciousness and fell to the floor once and then again the patient lost consciousness while walking, states this happened yesterday 31Oct2021. Stated when the patient lost consciousness, the patient completely blacked out for a few seconds each time. Stated today the patient lost consciousness again and went to the hospital there, he stated they discharged him and said him needs MRIs and a bunch of things that they did not had the equipment for in that country. The patient was waiting to go back to the states for testing. Stated the patient did not know if it was related to the vaccine or if the patient could be sick of something else. He confirmed the patient was not admitted to the hospital and wants to know if this could be related to the booster shot. The outcome of the events felt like lost his balance and started to faint, lost balance and fell, felt that the weakness was coming was not resolved while that of the events fatigue and loss of consciousness was unknown. No follow-up attempts are possible. No further information is expected.