sever upper gastric bleeding; black tarry stools; hemoglobin numbers dropped; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non-HCP). The reporter is the patient.  A 51-year-old male patient received BNT162b2 (BNT162B2), on 16Apr2022 at 12:00 as dose 4 (booster), single (Lot number: FK9895) at the age of 50 years, in left arm for covid-19 immunization. The patient's relevant medical history was not reported. The patient took concomitant medications. Vaccination history included: BNT162b2 (Dose Number: 3, Batch/Lot No: 320308D, Location of injection: Arm Left, Vaccine Administration Time: 12:00 PM), administration date: 29Oct2021, when the patient was 50-year-old, for COVID-19 immunization; BNT162b2 (Dose Number: 2, Batch/Lot No: FP2533, Location of injection: Arm Left, Vaccine Administration Time: 12:00 PM), administration date: 16Apr2021, when the patient was 49-year-old, for COVID-19 immunization; BNT162b2 (Dose Number: 1, Batch/Lot No: FN6204, Location of injection: Arm Left, Vaccine Administration Time: 12:00 PM), administration date: 24Mar2021, when the patient was 49-year-old, for COVID-19 immunization.  The following information was reported: GASTRIC HAEMORRHAGE (hospitalization, life threatening), 5 months 15 days 14 hrs 30 min after the suspect product(s) administration, outcome "recovering", described as "sever upper gastric bleeding"; FAECES DISCOLOURED (hospitalization, life threatening), 5 months 15 days 14 hrs 30 min after the suspect product(s) administration, outcome "recovering", described as "black tarry stools"; HAEMOGLOBIN DECREASED (hospitalization, life threatening), 5 months 15 days 14 hrs 30 min after the suspect product(s) administration, outcome "recovering", described as "hemoglobin numbers dropped". The patient was hospitalized for gastric hemorrhage, faeces discolored, hemoglobin decreased (hospitalization duration: 3 day(s)). The events "sever upper gastric bleeding", "black tarry stools" and "hemoglobin numbers dropped" required emergency room visit. The patient underwent the following laboratory tests and procedures: Hemoglobin: dropped from 13-14 down to 7-8; multiple tests: Unknown results; Esophagogastroduodenoscopy: Unknown results. Therapeutic measures were taken as a result of gastric hemorrhage, faeces discolored, hemoglobin decreased. Clinical course: Exactly 2 weeks after each of my last two doses on 16Apr2022 & 17Sep2022 patient was hospitalized for sever upper gastric bleeding. This was evident from black tarry stools and hemoglobin numbers dropped from 13-14 down to 7-8. The patient was admitted both times for multi night stays and multiple tests including multiple EGDs to try to locate the point of bleeding. These both happened exactly 2 weeks after Pfizer covid vax dose. Ae treatment: EGD with clips placed on poss bleed blood vessels. No covid prior vaccination and covid was tested post vaccination. No Known allergies. Took Probiotic in two weeks.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202201397769 Same reporter/patient, same drug/different dose, same AE;US-PFIZER INC-202201398221 Same reporter/patient, same drug/different dose, different AE;