Borderline septic; Small bowel obstruction; Post surgery ileus; Stomach still hurt; Was not able to use the restroom; Severe abdominal pain; Back pain; Vomiting; Soreness at the injection site; Fatigue; Loss of appetite; Flu-like symptoms.; This spontaneous case was reported by an other health care professional (subsequently medically confirmed) and describes the occurrence of SMALL INTESTINAL OBSTRUCTION (Small bowel obstruction), SEPSIS (Borderline septic) and POSTOPERATIVE ILEUS (Post surgery ileus) in a 35-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 027L20a and 013m20a) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Previously administered products included for Product used for unknown indication: Flu shot. Past adverse reactions to the above products included No adverse reaction with Flu shot.   On 06-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 05-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 06-Feb-2021, the patient experienced DECREASED APPETITE (Loss of appetite), INFLUENZA LIKE ILLNESS (Flu-like symptoms.), VACCINATION SITE PAIN (Soreness at the injection site) and FATIGUE (Fatigue). On 07-Feb-2021, the patient experienced ABDOMINAL PAIN UPPER (Stomach still hurt), CONSTIPATION (Was not able to use the restroom), ABDOMINAL PAIN (Severe abdominal pain), BACK PAIN (Back pain) and VOMITING (Vomiting). On 08-Feb-2021, the patient experienced SMALL INTESTINAL OBSTRUCTION (Small bowel obstruction) (seriousness criteria hospitalization and medically significant) and SEPSIS (Borderline septic) (seriousness criteria hospitalization and medically significant). On 12-Feb-2021, the patient experienced POSTOPERATIVE ILEUS (Post surgery ileus) (seriousness criterion medically significant). The patient was hospitalized from 08-Feb-2021 to 11-Feb-2021 due to SMALL INTESTINAL OBSTRUCTION. The patient was treated with MAGNESIUM CITRATE on 12-Feb-2021 for Postoperative ileus, at a dose of UNK dosage form and Surgery for Small intestinal obstruction. On 14-Feb-2021, POSTOPERATIVE ILEUS (Post surgery ileus) had resolved. In February 2021, INFLUENZA LIKE ILLNESS (Flu-like symptoms.), ABDOMINAL PAIN UPPER (Stomach still hurt), CONSTIPATION (Was not able to use the restroom), ABDOMINAL PAIN (Severe abdominal pain), BACK PAIN (Back pain), VACCINATION SITE PAIN (Soreness at the injection site), FATIGUE (Fatigue) and VOMITING (Vomiting) had resolved. At the time of the report, SMALL INTESTINAL OBSTRUCTION (Small bowel obstruction), SEPSIS (Borderline septic) and DECREASED APPETITE (Loss of appetite) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 08-Feb-2021, Computerised tomogram: abnormal (abnormal) Showed a small bowel obstruction and was borderline septic.. In February 2021, Pathology test: normal (normal) Part of the removed intestine was sent to pathology, nothing was found.. In 2021, X-ray: inconclusive (Inconclusive) Inconclusive.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   No relevant concomitant medications were reported.   On 08 Feb 2021, due to severe abdominal pain and back pain patient went to emergency room. Patient was diagnosed with small bowel obstruction with borderline septic during the emergency room visit. Patient had surgery in which 10 inches of small intestines was removed and had resectioning.   On 12 Feb 2021, patient experienced post surgery ileus and NG tube was placed, patient's stomach pumped, and magnesium citrate was given via the NG tube to clear. Patient stayed in the hospital and was released on 14 Feb 2021. Patient had bloodwork done to rule out blood disorders or clotting disorders and the results were pending at the time of this report.  Action taken with mRNA-1273 in response to the events was not applicable.  Company Comment  Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.