Dehydrated; Can't walk 3 feet without being short of breath and needing to sit down; Very weak; Headache; Vomiting; Diarrhea; Tired, completely in bed and couldn't work/ extreme fatigue; Arm was sore; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of PAIN IN EXTREMITY (Arm was sore), FATIGUE (Tired, completely in bed and couldn't work/ extreme fatigue), VOMITING (Vomiting), DIARRHOEA (Diarrhea) and DEHYDRATION (Dehydrated) in a 50-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 011A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    On 25-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage form. On 25-Feb-2021, the patient experienced PAIN IN EXTREMITY (Arm was sore). On 26-Feb-2021, the patient experienced FATIGUE (Tired, completely in bed and couldn't work/ extreme fatigue). On 01-Mar-2021, the patient experienced VOMITING (Vomiting), DIARRHOEA (Diarrhea) and HEADACHE (Headache). On 02-Mar-2021, the patient experienced ASTHENIA (Very weak). On 05-Mar-2021, the patient experienced DYSPNOEA (Can't walk 3 feet without being short of breath and needing to sit down). On an unknown date, the patient experienced DEHYDRATION (Dehydrated). The patient was treated with POTASSIUM (intravenous) for Adverse event, at a dose of UNK dosage form; MAGNESIUM for Adverse event, at a dose of UNK dosage form; ONDANSETRON (ZOFRAN [ONDANSETRON]) for Adverse event, at a dose of UNK dosage form; KETOROLAC TROMETHAMINE (TORADOL) for Adverse event, at a dose of UNK dosage form; METOCLOPRAMIDE (REGLAN [METOCLOPRAMIDE]) for Adverse event, at a dose of UNK dosage form and LOPERAMIDE HYDROCHLORIDE (IMODIUM) for Adverse event, at a dose of UNK dosage form. On 26-Feb-2021, FATIGUE (Tired, completely in bed and couldn't work/ extreme fatigue) had resolved. On 27-Feb-2021, PAIN IN EXTREMITY (Arm was sore) had resolved. On 05-Mar-2021, VOMITING (Vomiting) and HEADACHE (Headache) had resolved. At the time of the report, DIARRHOEA (Diarrhea), DEHYDRATION (Dehydrated), ASTHENIA (Very weak) and DYSPNOEA (Can't walk 3 feet without being short of breath and needing to sit down) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 04-Mar-2021, Chest X-ray: normal (normal) Normal. On 04-Mar-2021, Computerised tomogram: normal CT scan of abdomen was normal..     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       No concomitant medications provided. Wife states he has some underlying medical problems, but none reported. Other treatment in the emergency room included a stool sample (no results provided) and blood work, which was normal except his magnesium and potassium levels were really low. He received 3 bags of fluids as well. He is getting better but still has diarrhea, is very weak, can't walk three feet without being short of breath and needing to sit down.    This case was linked to MOD-2021-036812, MOD-2021-036769, MOD-2021-036814 (E2B Linked Report).