Patient went to the emergency room as she woke up itchy all over her body although there were no hives or rash, It was all over her body and covered her chest, neck, and legs, It went all the way up to the neck area; Throat tightening; Chest heaviness/has the occasional chest heaviness/Chest discomfort; Shortness of breath; Possible immunization reaction; This spontaneous case was reported by a consumer and describes the occurrence of PRURITUS (Patient went to the emergency room as she woke up itchy all over her body although there were no hives or rash, It was all over her body and covered her chest, neck, and legs, It went all the way up to the neck area), THROAT TIGHTNESS (Throat tightening), CHEST DISCOMFORT (Chest heaviness/has the occasional chest heaviness/Chest discomfort), DYSPNOEA (Shortness of breath) and VACCINATION COMPLICATION (Possible immunization reaction) in a 38-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 029L20A) for COVID-19 vaccination.     No medical history was provided by the reporter.  Concomitant products included VITAMIN C [ASCORBIC ACID] and MULTIVITAMINS [VITAMINS NOS] for an unknown indication.    On 26-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 29-Jan-2021, the patient experienced PRURITUS (Patient went to the emergency room as she woke up itchy all over her body although there were no hives or rash, It was all over her body and covered her chest, neck, and legs, It went all the way up to the neck area) (seriousness criterion medically significant), THROAT TIGHTNESS (Throat tightening) (seriousness criterion medically significant), CHEST DISCOMFORT (Chest heaviness/has the occasional chest heaviness/Chest discomfort) (seriousness criterion medically significant), DYSPNOEA (Shortness of breath) (seriousness criterion medically significant) and VACCINATION COMPLICATION (Possible immunization reaction) (seriousness criterion medically significant). The patient was treated with DIPHENHYDRAMINE HYDROCHLORIDE (BENADRYL [DIPHENHYDRAMINE HYDROCHLORIDE]) on 29-Jan-2021 for Adverse event, at an unspecified dose and frequency; DEXAMETHASONE (DECADRON [DEXAMETHASONE]) on 29-Jan-2021 for Adverse event, at an unspecified dose and frequency and METHYLPREDNISOLONE (MEDROL [METHYLPREDNISOLONE]) on 29-Jan-2021 for Adverse event, at an unspecified dose and frequency. On 29-Jan-2021, PRURITUS (Patient went to the emergency room as she woke up itchy all over her body although there were no hives or rash, It was all over her body and covered her chest, neck, and legs, It went all the way up to the neck area) and THROAT TIGHTNESS (Throat tightening) outcome was unknown. At the time of the report, CHEST DISCOMFORT (Chest heaviness/has the occasional chest heaviness/Chest discomfort), DYSPNOEA (Shortness of breath) and VACCINATION COMPLICATION (Possible immunization reaction) outcome was unknown.        mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was withdrawn on an unknown date.       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.; 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.