This is a spontaneous report from a contactable consumer (patient) received from a Pfizer-sponsored program. A 70-years-old female patient received second dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE: Solution for injection, Batch/Lot Number: EN6204), via an unspecified route of administration, administered in Arm Left on 10Mar2021 as single dose for COVID-19 immunization. Medical history included blood pressure abnormal from an unknown date and unknown if ongoing, surgery from 22Sep2020 to an unknown date (I had surgery on 22Sep), ongoing deafness (so actually loss of hearing 2 days before I got my second vaccine/five days later she woke up in the night and could not hear). Historical vaccine included at the age of 70 years patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE: Solution for injection, Batch/Lot Number: unknown), via an unspecified route of administration, on 17Feb2021 as single dose for COVID-19 immunization cause severe sores in my mouth, possibly have shingles or shingles in my mouth and it appears to be canker sore and shingles vaccine. Concomitant medication included Irbesartan 75 mg, orally for blood pressure abnormal. On an unspecified date, the patient reported I had loss of hearing in my ear, in my right ear, sores in her mouth. Reporter stated, I am, I have called because I got my COVID-19 Vaccine just last Wednesday, my second one and I had loss of hearing in my ear, in my right ear and then middle of night it just went away and went to my doctor and she sent to me eye, nose and throat doctor and Friday after the vaccine, I had to be put on Prednisone and that lower your immune system, so when I talk with the Pharmacist I asked her is that would appear with the shot, I had on Wednesday and she was unable to tell me because she said it was so new, so I was just wondering is that going to affect me on my immunity of the second vaccine, that I had start taking prednisone on Friday after day after I got the vaccine. When paraphrased the above concern, Patient stated, I actually I had my first vaccine on 17Feb and then 5 days after that I got severe sores in my mouth and then I went to my doctor, they call it I could possibly have shingles or shingles in my mouth it appears to be canker sore but I had the shingles vaccine then after I got back 5 days later that's when I woke up, so actually loss of hearing 2 days before I got my second vaccine and I talk to my doctor and she said, she thought I still go ahead and have the second vaccine but she said she didn't want to put me on the Prednisone because she said that will weaken my immunity but then it didn't get better and she sent me to Ear, Nose and throat he told my if I have any hope to getting my hearing back I had to start this medicine but that's what I am concerned about, so I took it but I was wondering if it interfere all with the second dose of giving me protection. The mouth sore that is improved, the hearing I still dealing with it, like I said I have been taking the medicine the Friday and then this Thursday the doctor said to come in and he is going to do some testing on my ear but it just come on, so it just middle of the midnight, persisting. patient stated, For my ear its like Prednisone. For the first 2 week I am taking 60 mg and then after 3 weeks, I take 2 tablets 40 mg and then the next week I take 10 mg for 2 days. Reporter stated that five days after she got mouth sores diagnosed as oral shingles after the first dose and then five days later she woke up in the night and could not hear. She thinks she has another reaction. This reaction occurred between the first and second dose of the vaccine. Reporter reported that she lost hearing in one ear. Reporter had the second vaccination on Wednesday and put on prednisone on Friday. Reporter was concerned about not having immunity because of taking prednisone so soon after her second dose. The patient underwent lab tests and procedures which included laboratory test: unknown results on Sep2020. Therapeutic measures were taken as a result of i had loss of hearing in my ear, in my right ear. The outcome of event i had loss of hearing in my ear, in my right ear was not recovered while for sores in her mouth was recovering.