symptoms of COVID/ believes it could be COVID; symptoms of COVID/ believes it could be COVID; terrible diarrhea; constant headache; Gas; Bloating; Her arm was sore for 24 hours; This is a spontaneous report from a contactable consumer (patient). A 55-year-old female patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE; Solution for injection, lot number: EL8982, unknown expiration), via injection once to right arm on 14Jan2021 at a single dose as she is eligible with first tier for vaccination.  Medical history and concomitant medications reported as none. The patient reported that she received the first dose of COVID vaccine on 14Jan2021 (Thursday). The next day (15Jan2021), her arm was sore for 24 hours after the shot, and she didn't have any side effects over the weekend. On 19Jan2021, Tuesday, she started having constant headache, and was experiencing problems with gas and bloating, it is very rare for her to have this issue, and it was building the last of couple days, she was uncomfortable and was taking over the counter medication for relief. She was keeping the headaches at bay with generic ibuprofen (lot: S200378, expiry: Mar2023), but if she missed a dose or is feeling better and doesn't take, it is coming back, it is consistent. Gas and bloating are primarily after eating, on Wednesday, after 24 hours it was ridiculous. She got some generic Extra Strength Gas Relief one tablet after eating (lot: 75257, expiry: Jun2022), and it was giving her some relief until early this morning. Tuesday, Wednesday, and Thursday, the gas and bloating was worse. Last night, her entire chest, she wanted to burp so bad, but couldn't because it really hurt, and it took a while for the next tablet to kick in and give relief, she was like where is this coming from, she didn't know it could build up so much. On 22Jan2021, she had a terrible diarrhea.  Diarrhea was painful and intense, she took generic Pepto Bismol 1-2 tablets, and she took 4, The first time she woke up at 04:30 AM and at 7 another wave hit her, so she took another two tablets. Right now, she is feeling okay, but the gas is building up, her chest is filling, she is uncomfortable. The patient asked if these are reported side effects.  She works in a dental office, and the doctor is knowledgeable and sensitive to COVID, and even though those symptoms are not listed as side effects on the information sheet, the doctor said they are symptoms of COVID, and even though those symptoms are not listed as side effects on the information sheet, the doctor said they are symptoms of COVID, are these side effects or may she have COVID, though she doesn't know who she could have gotten COVID from. Out of protection for patients at dental clinic, the HCP at clinic wants her to get the COVID test as he believes it could be COVID and not side effect of the vaccine. She doesn't want to quarantine for nothing if it is just side effects of the vaccine. She will be getting rapid diagnostic for COVID and not the antibody test. She thinks she should get tested, but there is no testing appointment available until tomorrow, and she does not want to self-quarantine needlessly, she will live through it, she is happy to get the test, but she doesn't want to lose 2 weeks of pay if others are reporting the same side effects. She was happy to get the vaccine. The patient recovered from the event arm sore on 16Jan2021; not yet recovered from events constant headache, gas, and bloating; while unknown outcome for the remaining events.