low blood pressure, when she stands she faints; cellulitis; tingling sharp pain in feet and toes; a high heart rate; pain in hands which moves through her body during the night/ sharp pain in her feet and toes; rash/rash in middle side back; vomiting, she can't eat gags when eating regular food; fever; This spontaneous case was reported by a consumer and describes the occurrence of HYPOTENSION (low blood pressure, when she stands she faints) and CELLULITIS (cellulitis) in a 44-year-old female patient 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 Sulfonamide allergy.   In March 2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. In April 2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. In May 2021, the patient experienced HYPOTENSION (low blood pressure, when she stands she faints) (seriousness criterion hospitalization), CELLULITIS (cellulitis) (seriousness criterion medically significant), PARAESTHESIA (tingling sharp pain in feet and toes), HEART RATE INCREASED (a high heart rate), PAIN IN EXTREMITY (pain in hands which moves through her body during the night/ sharp pain in her feet and toes), RASH (rash/rash in middle side back), VOMITING (vomiting, she can't eat gags when eating regular food) and PYREXIA (fever). The patient was treated with MIDODRINE for Low blood pressure, at an unspecified dose and frequency and SULFANILAMIDE (SULFA [SULFANILAMIDE]) (intravenous) for Cellulitis, at an unspecified dose and frequency. At the time of the report, HYPOTENSION (low blood pressure, when she stands she faints) and VOMITING (vomiting, she can't eat gags when eating regular food) had not resolved and CELLULITIS (cellulitis), PARAESTHESIA (tingling sharp pain in feet and toes), HEART RATE INCREASED (a high heart rate), PAIN IN EXTREMITY (pain in hands which moves through her body during the night/ sharp pain in her feet and toes), RASH (rash/rash in middle side back) and PYREXIA (fever) outcome was unknown.            Concomitant medications were not reported . Treatment history includes steroid pack of pills .  Action taken with mRNA-1273 (Moderna COVID-19 Vaccine) in response to the events was not applicable.  Patient was hospitalized for a period of three weeks around that  time with an admitting diagnosis of low blood pressure,believed to have been brought on by her known sulfa allergy. Reporter believes to be Guillain-Barre based on the collection of symptoms and what research he had done online.  Company Comment 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. There is confounding by a reported medical history of sulfa allergy.; 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. There is confounding by a reported medical history of sulfa allergy.