Terrible headache until 18JAN2021; Blood pressure was still high pulse was high 120; Ringing in ears; Sometimes dizzy; Fatigue; SOB; Could be a Tetany or dystonic reaction to the vaccine due to timing of everything; Whole body hurt; Headache; Left side of face cured up; Couldn't move left side; Fainted when she got the shot; Blood pressure was 196/148; Hyperventilation syndrome; Muscless tightened all over body; the hospital said it was Hyperventilation syndrome which can cause hypocalcemia; Blood pressure was still high pulse was high 120; Could be a Tetany or dystonic reaction to the vaccine due to timing of everything; A spontaneous report (United States) was received from a consumer concerning a 44-year-old female patient, who received Moderna's COVID-19 Vaccine (mRNA-1273) and experienced fainted when she got the shot, blood pressure was 196/148, left arm started to curl up like a claw,  pulled her arm in, pulse was high 120,  right hand cured into a claw and muscles all over body tightened, hyperventilation syndrome, left side of face, blood pressure was still high,  terrible headache until 18 Jan 2021,  whole body hurt, feet and calf's, neck, left side of face cured up, left side of face was dropping, couldn't move left side, fatigue, sob, ringing in ears, sometimes dizzy and tetany or dystonic reaction.  The patient's medical history included a history of fainting, COVID-19 diagnosis in September 2020, lasting 5 weeks, followed by a diagnosis of pneumonia. Concomitant medications were not provided.   On 16 Jan 2021, the patient received their first of two planned doses of mRNA-1273 (Batch/Lot#: unknown) intramuscularly in the left arm for prophylaxis of COVID-19 infection.  On 16 Jan 2021, the patient fainted after receiving the vaccine and experienced elevated BP of 196/148, left arm started to curl up like a claw, pulled her arm in and high pulse of 120. Right hand cured into a claw and muscles all over body tightened. Hospital said it was Hyperventilation syndrome which can cause hypocalcemia which can cause tetany.  On 17 Jan 2021, the patient was hospitalized and got IV of 100mg of Benadryl- body calmed down except for left side of face, blood pressure was still high 190/140-had terrible headache until 18 Jan 2021 a severe headache, continued elevated BP of 190/140 and 192/144, whole body pain, more muscular pain and muscular tightness in feet, legs, experienced drooping on the left side of the face and inability to move on the left side. Went to the Emergency Department prior to being admitted. On 18 Jan 2021, the patient was admitted to the hospital for tests to determine if the patient had a stroke. The test results were negative for a stroke. Ongoing fatigue, shortness of breath, headache, ringing in ears, sometimes dizzy. Symptoms are getting better but still lingering  Treatments received were reported as Benadryl via an IV, Ibuprofen daily as needed and a shot of Toradol.  Action taken with mRNA-1273 in response to the events was not reported.  The outcome of the event headache was reported as resolved. The outcome of the events fainted, blood pressure was 196/148, left arm started to curl up like a claw,  pulled her arm in, pulse was high 120,  right hand cured into a claw and muscles all over body tightened, hyperventilation syndrome, left side of face, blood pressure was still high,  terrible headache until 18 Jan 2021,  whole body hurt, feet and calf's, neck, left side of face cured up, left side of face was dropping, couldn't move left side, fatigue, sob, ringing in ears, sometimes dizzy and tetany or dystonic reaction, fatigue, shortness of breath, ringing in ears, sometimes dizzy was not reported.; Reporter's Comments: This case concerns a 44 year old, female patient, with history of fainting, COVID-19 (September 2020), who experienced a serious unexpected event of syncope, hemiplegia, facial paralysis and dystonia among others, 2 day after receiving 1st dose of mRNA- 1273 (Lot# Unknown). Very limited information regarding this event has been provided at this time. Further information has been requested.