incredibly sick; difficulty walking; almost 24 hours a day for 3 days, then 22 hours the next few days, and the amount of sleep declined every day after that; brain fog; headache; fever of 101 degrees; chills; extreme fatigue; diarrhea; light headed; felt like she "has the flu every day; Off Balance; This spontaneous case was reported by a nurse and describes the occurrence of DIARRHOEA (diarrhea), DIZZINESS (light headed), INFLUENZA LIKE ILLNESS (felt like she "has the flu every day), BALANCE DISORDER (Off Balance) and MALAISE (incredibly sick) in a 50-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 042L20A and 003A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concomitant products included DOXYCYCLINE from 13-Feb-2021 to an unknown date for Cyst.   On 23-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 07-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 07-Mar-2021, the patient experienced DIARRHOEA (diarrhea), DIZZINESS (light headed), INFLUENZA LIKE ILLNESS (felt like she "has the flu every day), BALANCE DISORDER (Off Balance) and FATIGUE (extreme fatigue). 07-Mar-2021, the patient experienced CHILLS (chills). On 08-Mar-2021, the patient experienced MALAISE (incredibly sick), GAIT DISTURBANCE (difficulty walking), FEELING ABNORMAL (brain fog) and PYREXIA (fever of 101 degrees). 08-Mar-2021, the patient experienced HYPERSOMNIA (almost 24 hours a day for 3 days, then 22 hours the next few days, and the amount of sleep declined every day after that). The patient was treated with PARACETAMOL (TYLENOL) on 07-Mar-2021 at an unspecified dose and frequency; IBUPROFEN (MOTRIN [IBUPROFEN]) on 07-Mar-2021 at an unspecified dose and frequency and PREDNISONE on 05-Apr-2021 at an unspecified dose and frequency. At the time of the report, DIARRHOEA (diarrhea), DIZZINESS (light headed), INFLUENZA LIKE ILLNESS (felt like she "has the flu every day), BALANCE DISORDER (Off Balance), MALAISE (incredibly sick), GAIT DISTURBANCE (difficulty walking), HYPERSOMNIA (almost 24 hours a day for 3 days, then 22 hours the next few days, and the amount of sleep declined every day after that), FEELING ABNORMAL (brain fog), CHILLS (chills), FATIGUE (extreme fatigue) and PYREXIA (fever of 101 degrees) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 07-Mar-2021, Body temperature: 101 (Inconclusive) Fever 101 degrees. On an unknown date, Blood pressure measurement: 140/100 (High) BP 140/100. On an unknown date, Echocardiogram: (normal) echo was normal.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular), the reporter did not provide any causality assessments.    Symptom text: Patient called her PCP but she told her that she  caught a virus and didn't catch that her symptoms were neurological. She saw an allergy/immunology doctor 04/05/21 and doctor gave her prednisone. She was on 40mg a day for 3 days and on the fourth day she woke up feeling great but doc had me step down my dose and the next day all my symptoms were back and she was back to being off balance. He kept me at 30mg for a week and shetapered to 20mg then 10mg, not currently on any medication. The mornings are the hardest. At some point she realized that she started to feel a little better about 6pm in the evening then it became 3pm and now She start to feel better about 12pm but my symptoms are never gone. My brain MRI was good.    Most recent FOLLOW-UP information incorporated above includes: On 24-May-2021: Follow up received on 24MAY2021, included reporter details, patient demographic details, additional lab data, concomitant and treatment medications and  additional events.