disoriented/did not know where he is; fell down; extreme fatigue; low grade fever; chills; muscle aches; sweating; dizziness; brain fog; couldn't remember simple stuff; extreme pain in his legs/extreme pain in calves; couldn't feel his feet; mucus in stool; slight chest pains; does not have an appetite; cough; Extreme sense of urgency to use the rest room; feels like acid is coming out of his rear end; adverse reaction to vaccine; WBC elevated; bright red blood in stool; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of HAEMATOCHEZIA (bright red blood in stool) in a male patient of an unknown age who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 04-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 02-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 02-Apr-2021, the patient experienced HYPERHIDROSIS (sweating), DIZZINESS (dizziness), FEELING ABNORMAL (brain fog), MEMORY IMPAIRMENT (couldn't remember simple stuff), PAIN IN EXTREMITY (extreme pain in his legs/extreme pain in calves), HYPOAESTHESIA (couldn't feel his feet), FATIGUE (extreme fatigue), PYREXIA (low grade fever), CHILLS (chills) and MYALGIA (muscle aches). In April 2021, the patient experienced HAEMATOCHEZIA (bright red blood in stool) (seriousness criterion medically significant), MUCOUS STOOLS (mucus in stool), CHEST PAIN (slight chest pains), DECREASED APPETITE (does not have an appetite), COUGH (cough), DEFAECATION URGENCY (Extreme sense of urgency to use the rest room), ANORECTAL DISCOMFORT (feels like acid is coming out of his rear end) and VACCINATION COMPLICATION (adverse reaction to vaccine). April 2021, the patient experienced WHITE BLOOD CELL COUNT INCREASED (WBC elevated). On 16-Apr-2021, the patient experienced DISORIENTATION (disoriented/did not know where he is) and FALL (fell down). The patient was treated with PARACETAMOL (TYLENOL) in April 2021 for Adverse event, at a dose of 1 dosage form, UNK; AZITHROMYCIN (Z-PAK) from 06-Apr-2021 to 10-Apr-2021 for Adverse event, at a dose of 1 dosage form and GABAPENTIN in April 2021 for Adverse event, at a dose of 1 dosage form. At the time of the report, HAEMATOCHEZIA (bright red blood in stool), HYPERHIDROSIS (sweating), DIZZINESS (dizziness), FEELING ABNORMAL (brain fog), MEMORY IMPAIRMENT (couldn't remember simple stuff), PAIN IN EXTREMITY (extreme pain in his legs/extreme pain in calves), HYPOAESTHESIA (couldn't feel his feet), MUCOUS STOOLS (mucus in stool), CHEST PAIN (slight chest pains), DECREASED APPETITE (does not have an appetite), COUGH (cough), DISORIENTATION (disoriented/did not know where he is), FALL (fell down), DEFAECATION URGENCY (Extreme sense of urgency to use the rest room), ANORECTAL DISCOMFORT (feels like acid is coming out of his rear end), FATIGUE (extreme fatigue), PYREXIA (low grade fever), CHILLS (chills) and MYALGIA (muscle aches) had not resolved and VACCINATION COMPLICATION (adverse reaction to vaccine) and WHITE BLOOD CELL COUNT INCREASED (WBC elevated) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 06-Apr-2021, Oxygen saturation: 96 % (normal) 96%. In April 2021, Chest X-ray: lungs were clear (normal) lungs were clear. In April 2021, SARS-CoV-2 test: negative (Negative) negative. In April 2021, White blood cell count: elevated (High) elevated.         Concomitant medicines were not provided  It was reported that ever since the patient received his second dose, he has had low grade fever, chills, sweating, dizziness, extreme fatigue, muscle aches, brain fog, and couldn't remember simple stuff. Treatment was reported as acetaminophen (TYLENOL) and the symptoms persisted from 03-Apr-2021 to 05-Apr-2021. On 06-Apr-2021, the patient's wife started giving him azithromycin (Z-PAK) that they had at home. He started to feel better but still ran a fever. Then he felt better and went out, but came home and was extremely fatigued with extreme pain in his legs and calves and he couldn't feel his feet. The patient was reported to have no co-morbidities. On 10-Apr-2021, the patient finished the azithromycin (Z-PAK). On 11-Apr-2021, he started the same symptoms of low grade fever, chills, sweating, dizziness, extreme fatigue, muscle aches, and brain fog. On 12-Apr-2021, he had extreme leg pain. He was checked for a urinary tract infection (UTI) and didn't have a UTI. He had a cough and slight chest pains. He also received intravenous (IV) fluids. The patient was still having extreme leg pain. He tried gabapentin but it didn't help. On 16-Apr-2021, he woke up to go to the restroom, was disoriented and fell down. He did not know where he is. The doctor said the patient had an adverse reaction to the vaccine.  Treatment included IV Fluids  Action taken with mRNA-1273 in response to the event was not applicable.  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.