Reflux and gastritis; 2 days later after his 2nd dose, he woke up in the middle of the night; 2 days later after his 2nd dose, he woke up in the middle of the night with stomach discomfort to the point that he is unable to eat solid foods./bad discomfort in his abdomen, upper abdomen area and you know it was actually worsening; bad discomfort in his abdomen, upper abdomen area and you know it was actually worsening; he is unable to eat solid foods/he can't eat; significant inflammation on the esophagus to stomach area that would be further confirmed by endoscopy by next week.; Mentioned that nausea and vomiting has been reported; Mentioned that nausea and vomiting has been reported; upper abdominal pain; Started to get abdominal pain; ends up with extreme pain; This is a spontaneous report from a contactable consumer (parent). A 16-year-old male patient received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, lot number: EW0176), via intramuscularly in left arm, on 09May2021 as a single dose for COVID-19 immunisation. The patient medical history included positive for Covid-19 in Feb2021. Concomitant medications were not reported. No other vaccinations within four weeks prior to the first administration. Previously the patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, lot number: EW0170), via intramuscularly in left arm, on 18Apr2021 (at age 16-year-old) at 5:30 PM as a single dose for COVID-19 immunisation and experienced stomach upset, nausea, reflux and gastritis. It was reported that patient had experienced lasting side effect post-vaccination that even lead to 2 incidents of visiting the Emergency Room (ER). patient was positive for COVID way back February 2021. Also, it has been reported that 2 days later after his 2nd dose, he woke up in the middle of the night with stomach discomfort to the point that he was unable to eat solid foods all in May2021. This event led to the ER and his physician found out that the side effect reported was localized from the esophagus up to the lower abdomen. Their initial hunch was it could be a reflux or gastritis in May2021. Test results showed that EKG was fine and no inflammation on the heart but there was a significant inflammation on the esophagus to stomach area in May2021 that would be further confirmed by endoscopy by next week. Mentioned that nausea and vomiting has been reported in 2021. Caller also reiterated that nothing triggered the side effect except for the shots that was given prior. patient could be having intestinal reaction through the shot. He received his second shot on May 9th and a few days after he started to get abdominal pain, upper abdominal pain in 2021 and it has since now to a point where he can't eat, having very bad discomfort in his abdomen, upper abdomen area and you know it was actually worsening in May2021 and we don't know why and it hits him on after the shot. After 3 weeks later had his second shot and within like few days he started to have symptoms, waking up in the middle of night with discomfort. Since then you know he was been declining and now he was unable to get all his food down, if he does he ends up with extreme pain in 2021. We have been taking him to the hospital, they treating him for reflux and gastritis and they checked they did an EKG on him to make sure if there was any inflammation around heart. Treatment: Reporter stated, "He went to the ER twice, the emergency room twice and they are treating him with Prevacid medication and also treating him with medication called Carafate, they are waiting to do an endoscopy. Event reflux or gastritis was reported with seriousness of hospitalization. The outcome of the events abdominal discomfort, condition worsened, pain, reflux gastritis was not recovered, while for remaining events was unknown.  Follow up attempts are needed; additional information has been requested.