feels like he might be getting the flu; pain in stomach; headache; anything he eats turns to acid; This is a spontaneous report from a contactable consumer (patient). A 67-years-old male patient received the first dose of BNT162B2 Pfizer-BioNTech COVID-19 Vaccine, in local center, via an unspecified route of administration, in left deltoid on 10Mar2021 at 09:30, at 67 years of age, (Batch/Lot Number: EN6206) as single dose for COVID-19 immunization. Medical history included ongoing sarcoidosis he has had for at least 35 years, oozing leg from 2019 and "underlying health issues". He had bloodwork done 3 times and it came back negative for COVID-19: he had one done in Mar2020, one done in Jun2020, and one done three months before this report (Dec2020). Historical vaccine included flu shot in Sep2020 or Oct2020 with no problem and he gets it every year. Concomitant medications included olmesartan/hydrochlorothiazide 40 mg/25mg tablets from 2019 and ongoing for blood pressure; amlodipine from 2019 and ongoing for blood pressure abnormal; oxybutynin for incontinence ("to control his bladder so that he does not have to go"), from an unknown date, almost one year before this report (2020) and ongoing; colchicine (COLCRYS) (not actually taking it as he is out of it), from the middle of Feb2021 for gout; allopurinol from the middle of Feb2021 and ongoing for gout; calcium carbonate (ACID BREAKTHROUGH FORMULA) for antacid therapy, from an unknown date and ongoing ("has been taking it on and off for 20 years"); ibuprofen, taking on and off for the last 5 years (now ongoing) for pain, from an unknown date; ascorbic acid (VITAMIN C ACID) from an unknown date (has been on at least the last 4 years) for cold or flu prophylaxis; ongoing fish oil (has been on for the last 2 or 3 years) for blood cholesterol (he was told it was supposed to help cholesterol), from an unknown date and metformin for pre-diabetes ("his numbers are very low, but they told him to take it so that he does not get diabetes"), from an unknown date (has been on it for about a year and a half). Past drug history included oxycodone-acetaminophen, which was last filled on 03Oct2011. In Mar2021, two weeks after the first dose of BNT162B2 Pfizer-BioNTech COVID-19 Vaccine he did not feel the best: he felt fine the first week, but then, on "Sunday" [21Mar2021] the patient felt like he might be getting the flu, he experienced pain in stomach, stating that the pain is there but it does not hurt that bad, headache, defined as "not that bad, just a mild headache; it is about the same, it is an annoying ache", and anything he eats turns to acid. The events didn't require ED or physician office visit. The patient added that there is a problem with his leg where it is oozing, started two years before this report, and they are going to give him antibiotics, cephalexin 500 mg capsule. His second vaccine dose is planned on 31Mar2021 and he is afraid that antibiotics could interfere with the vaccine efficacy. The patient didn't receive any treatment, as he thought that this would just go away in 2 to 3 days. At the time of the report the stomach pain was ongoing ("it goes and comes"), as well as the event "anything he eats turns to acid"; the outcome of the other events was unknown.