throwing up; gets so dehydrated; gets so dehydrated and passes out they think she is dead; went into a-fib; bleeding; Uncontrollable diarrhea; weak; crying; pooping herself; headache; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of LOSS OF CONSCIOUSNESS (gets so dehydrated and passes out they think she is dead), ATRIAL FIBRILLATION (went into a-fib), HAEMORRHAGE (bleeding), VOMITING (throwing up) and DEHYDRATION (gets so dehydrated ) in a female 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.     Concurrent medical conditions included Dementia.    On 09-Apr-2021, the patient received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 10-Apr-2021, the patient experienced LOSS OF CONSCIOUSNESS (gets so dehydrated and passes out they think she is dead) (seriousness criteria hospitalization and medically significant), ATRIAL FIBRILLATION (went into a-fib) (seriousness criteria hospitalization and medically significant), HAEMORRHAGE (bleeding) (seriousness criterion medically significant), VOMITING (throwing up) (seriousness criterion hospitalization), DEHYDRATION (gets so dehydrated ) (seriousness criterion hospitalization), DIARRHOEA (Uncontrollable diarrhea), ASTHENIA (weak), CRYING (crying), ANAL INCONTINENCE (pooping herself) and HEADACHE (headache). The patient was hospitalized on 10-Apr-2021 due to ATRIAL FIBRILLATION, DEHYDRATION, LOSS OF CONSCIOUSNESS and VOMITING. At the time of the report, LOSS OF CONSCIOUSNESS (gets so dehydrated and passes out they think she is dead), ATRIAL FIBRILLATION (went into a-fib), HAEMORRHAGE (bleeding), VOMITING (throwing up), DEHYDRATION (gets so dehydrated ), DIARRHOEA (Uncontrollable diarrhea), ASTHENIA (weak), CRYING (crying), ANAL INCONTINENCE (pooping herself) and HEADACHE (headache) outcome was unknown. Not Provided          Patient was taking blood pressure medications concomitantly.  Patient has been in and out of the hospital weeks at a time since 10 Apr 2021. She gets released and then within 12 hours, the ambulance comes again and picks her up. She started experiencing symptoms within 12 hours of receiving the vaccine. Uncontrollable diarrhea, throwing up, headache, weak, went into a-fib, she gets so dehydrated and passes out they think she is dead. She has been throwing up and pooping herself. The patient is bleeding and crying and begging for someone to help her because the doctors do not know what to do. They can't keep her in the hospital. The vaccine kicked started her dementia really bad, before receiving the vaccine, she was stable on her medications and her dementia, but within 12 hours of getting the vaccine and she went downhill. They are getting backed up on bills, all the patient's husband does is cry, he is basically watching his wife die. The patient doesn't understand why she feels the way she does. They need help because nobody can help her. The hospital keeps releasing her because they can not keep her, insurance is not paying for it. The patient has not had any problems at all until now. She was sent home on o1 May 2021 and readmitted again on 02 May 2021. No treatment information was provided.  Action taken with mRNA in respect to the events was not applicable.  Company Comment: Based on current available information and the temporal association between product use and the start date of the events a causal relationship cannot be excluded.; Sender's Comments: Based on current available information and the temporal association between product use and the start date of the events a causal relationship cannot be excluded.