Abdominal pain; Went to the ER because he could not function; Inflammatory markers are way up; This spontaneous case was reported by a consumer and describes the occurrence of ABDOMINAL PAIN (Abdominal pain), IMPAIRED WORK ABILITY (Went to the ER because he could not function) and INFLAMMATORY MARKER INCREASED (Inflammatory markers are way up) in a 37-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination.     Previously administered products included for COVID-19 vaccination: Pfizer COVID 19 vaccine (received Pfizer COVID 19 vaccine for his primary doses). Past adverse reactions to the above products included No adverse event with Pfizer COVID 19 vaccine.    On an unknown date, the patient received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, the patient experienced ABDOMINAL PAIN (Abdominal pain) (seriousness criterion hospitalization), IMPAIRED WORK ABILITY (Went to the ER because he could not function) (seriousness criterion hospitalization) and INFLAMMATORY MARKER INCREASED (Inflammatory markers are way up) (seriousness criterion hospitalization). The patient was hospitalized for 12 days due to ABDOMINAL PAIN, IMPAIRED WORK ABILITY and INFLAMMATORY MARKER INCREASED. At the time of the report, ABDOMINAL PAIN (Abdominal pain), IMPAIRED WORK ABILITY (Went to the ER because he could not function) and INFLAMMATORY MARKER INCREASED (Inflammatory markers are way up) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Blood test: result not reported (Inconclusive) Result not reported. On an unknown date, Computerised tomogram: result not reported (Inconclusive) Result not reported. On an unknown date, Endoscopy: result not reported (Inconclusive) Result not reported. On an unknown date, Inflammatory marker test: high (High) inflammatory makers are way up. On an unknown date, Laboratory test: result not reported (Inconclusive) Result not reported.         After booster dose patient had severe abdominal pain and went to urgent care and was given antigas medicine and presently he was still at the hospital. No concomitant information were reported by the reporter; Sender's Comments: This is a Spontaneous case concerning a 36 year old male patient with no history reported, who experienced the unexpected serious events of Abdominal pain, Impaired work ability and Inflammatory markers increased (seriousness criterion hospitalization), which occurred unknown days and time after the third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route).The caregiver does not have his son's vaccination information. Patient was Previously administered with Pfizer COVID 19 vaccine for his primary doses and had No adverse events with Pfizer COVID 19 vaccine. The patient was hospitalized for 12 days due to events. He had no findings during the hospitalization. He underwent CT scan, endoscopy, gallbladder test and several blood tests. His inflammatory makers were very high. At the time of the report outcome of the events was unknown. After booster dose patient had severe abdominal pain and went to urgent care and was given antigas medicine and presently he was still at the hospital. No concomitant medication details were reported by the reporter. The benefit-risk relationship of of mRNA-1273 vaccine is not affected by this report.