Headache; Low grade fever; body aches; Fatigue; At approximately 26 hours after receiving the COVID-19 vaccine I experienced very severe abdominal pain/ This pain was a stabbing sharp type pain/ pain was located in my abdominal upper left quadrant; This is a spontaneous report from a contactable consumer (patient himself). A 29-year-old male patient received the second dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: EP7534; Expiration Date: unknown) via an unspecified route of administration in the right arm on 06Apr2021 at 13:00 (at the age of 29-years-old) as a DOSE 2, SINGLE for COVID-19 immunization. The patient had no medical history and concomitant medication. The patient had no known allergies to medications, food or other products. The patient previously received the first dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: EN6204; Expiration Date: unknown) via an unspecified route of administration in the leg left on 15Mar2021 at 17:30 (at the age of 29-years-old) as a DOSE 1, SINGLE for COVID-19 immunization. The patient did not receive any other vaccines within four weeks prior to the vaccination. Prior to the vaccination, the patient was not diagnosed with COVID-19. On 07Apr2021 at 15:00, approximately 26 hours after receiving the COVID-19 vaccine, the patient experienced very severe abdominal pain. On a scale of 1-10, 1 being no pain and 10 being the worst pain of his life, the patient would rate the pain as a 7-8 and the patient had not ate any meals which caused any digestive symptoms such as nausea or diarrhea. This pain was a stabbing sharp type pain and was relieved when, laid in a fowler's/supine position for approximately 10 minutes. The pain was located in abdominal upper left quadrant. Once, the patient stood up again the pain became unbearable. On 08Apr2021, the day after receiving the vaccine, the patient experienced headache, low grade fever, body aches and fatigue which, the patient had expected to experience after receiving the vaccine. Did not take any medications to relieve the symptoms. The following day the pain became a dull pain and would rate the pain as a 4 on the third day after receiving the vaccine. The pain remained in the upper right quadrant of the abdomen. Took antacid, but symptoms remained same. The events did not result in doctor or other healthcare professional office/clinic visit, emergency room/department or urgent care. The patient did not receive any treatment for the events other than abdomen pain. Therapeutic measures were taken as a result of upper abdomen pain and included treatment himself with antacid. Since the vaccination, the patient had not been tested for COVID-19. The patient underwent lab tests and procedures which included pain assessment: would rate the pain as a 7-8; on a scale of 1-10, 1 being no pain and 10 being the worst pain of his life on 07Apr2021 and again pain assessment: 4 on 09Apr2021. The clinical outcome of the events very severe abdominal pain/this pain was a stabbing sharp type pain, headache, low grade fever, body aches and fatigue was recovered on an unspecified date in Apr2021. No follow-up attempts are required. No further information is expected.