he was in pain so long and he was considering ending the pain all together; he was in pain so long; Feels like acid in his mouth/ burning mouth syndrome; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 73 year-old male patient received bnt162b2 (BNT162B2) (Batch/Lot number: unknown) as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "I am allergic to the medicine" (ongoing), notes: The medication they gave me for pain, I  can't take it because I am allergic to the medicine. The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (DOSE 2, Single), for Covid-19 immunization; Bnt162b2 (DOSE 1, Single), for Covid-19 immunization. The following information was reported: SUICIDAL IDEATION (hospitalization, medically significant) with onset Jun2021, outcome "unknown", described as "he was in pain so long and he was considering ending the pain all together"; PAIN (hospitalization) with onset Jun2021, outcome "not recovered", described as "he was in pain so long"; BURNING MOUTH SYNDROME (hospitalization) with onset Jun2021, outcome "not recovered", described as "Feels like acid in his mouth/ burning mouth syndrome". Therapeutic measures were taken as a result of pain, burning mouth syndrome.  Clinical course: The patient been diagnosed with "burning mouth syndrome which is a nerve condition. He had symptoms since Jun2021, and it was diagnosed by a neurologist in nov2021. He was not sure when symptoms started, it may have been before the PBCV booster dose or shortly after the booster, felt like there were acid in his mouth. The medication they gave him for pain, he couldn't take it because he was allergic to the medicine and he was in pain 24hr/day, 7 days per week. The patient states he didn't take medication 2 days and it helps for a couple hours per day. It was a mood enhancer. He stated oragel uses for the pain, but it made his stomach upset if he uses to often. This part of a vaccination side effect or something he was going to have to live with, he was not sure. He stated he knows it's all the time and his doctor gave him medication, but he was allergic to the ones that work the best. He said it happened not too long after the booster, around the same time frame. He had 2 shots before and didn't have a reaction that he knows of. He states it's like someone dumped hydrochloric acid in his mouth and he was on the 3rd floor mental health ward he was in pain so long and he was considering ending the pain all together. Patient was at psychiatric facility due to suicidal thoughts. At the time of reporting, he was safe and his wife in the other room. Patient was asking is there a way to know if he picked up the disease after he had the vaccine and was boosted, is there any way to find out, a test to figure out if anything is related and can be done for the pain in his mouth. He stated it's been from Jun2021 to now and he was trying to figure out what can be done to make this stop, the only thing that seems to help was Orajel, that makes the pain go away but doesn't work more than 1-2 hours then he was in pain the other 22-23 hours out of 24 hours.  The lot number for bnt162b2 was not provided and will be requested during follow up.