Bloody stool; Stomach had an infection (in the lining),; Discoloration of stool; 1st dose: few days after dose, she had a viral infection; Side effects worsened and she needed an ambulance; Neck and back pain; Neck and back pain; Right arm has sharp pain that goes from neck to fingers; Cold sweats; No appetite (for a month or so); Felt sick; No energy; feeling cold; she lost 10 lbs; Body and muscle aches; Headache; Nausea; This spontaneous case was reported by a consumer and describes the occurrence of HAEMATOCHEZIA (Bloody stool) and GASTRIC INFECTION (Stomach had an infection (in the lining),) in a 34-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 002C21A and 039B21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 30-Apr-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 28-May-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On an unknown date, the patient experienced HAEMATOCHEZIA (Bloody stool) (seriousness criterion medically significant), GASTRIC INFECTION (Stomach had an infection (in the lining),) (seriousness criterion medically significant), FAECES DISCOLOURED (Discoloration of stool), VIRAL INFECTION (1st dose: few days after dose, she had a viral infection), CONDITION AGGRAVATED (Side effects worsened and she needed an ambulance), BACK PAIN (Neck and back pain), NECK PAIN (Neck and back pain), PAIN IN EXTREMITY (Right arm has sharp pain that goes from neck to fingers), COLD SWEAT (Cold sweats), DECREASED APPETITE (No appetite (for a month or so)), MALAISE (Felt sick), ASTHENIA (No energy), FEELING COLD (feeling cold), WEIGHT DECREASED (she lost 10 lbs), MYALGIA (Body and muscle aches), HEADACHE (Headache) and NAUSEA (Nausea). The patient was treated with Physical therapy for Back pain; Physical therapy for Neck pain; Physical therapy for Pain in extremity; Physical therapy for Malaise; Physical therapy for Asthenia and Physical therapy for Myalgia. At the time of the report, HAEMATOCHEZIA (Bloody stool), GASTRIC INFECTION (Stomach had an infection (in the lining),), FAECES DISCOLOURED (Discoloration of stool), VIRAL INFECTION (1st dose: few days after dose, she had a viral infection), CONDITION AGGRAVATED (Side effects worsened and she needed an ambulance), BACK PAIN (Neck and back pain), NECK PAIN (Neck and back pain), PAIN IN EXTREMITY (Right arm has sharp pain that goes from neck to fingers), COLD SWEAT (Cold sweats), DECREASED APPETITE (No appetite (for a month or so)), MALAISE (Felt sick), ASTHENIA (No energy), FEELING COLD (feeling cold), WEIGHT DECREASED (she lost 10 lbs), MYALGIA (Body and muscle aches), HEADACHE (Headache) and NAUSEA (Nausea) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Weight: decreased (Low) lost weight (10 lbs).         Relevant concomitant medications were not reported. Patient consulted about adverse events with her primary HCP and scheduled for a therapy like physical therapy and colonoscopy. She went to consult with a rheumatologist also. Treatment information was not provided.   This case was linked to MOD-2021-283132 (Patient Link).; Sender's Comments: This case concerns a 34 Y/O female hospitalized with serious unexpected hematochezia and gastric infection, as well as non-serious faeces discolored, viral infection, condition aggravated, back pain, neck pain, pain in extremity, cold sweat, felling cold, decreased appetite, weight loss, malaise, asthenia, myalgia, headache, nausea. Based on current available information and temporal association between use of the product and the start date of the event, a causal relationship cannot be excluded.