itchy/an itching all over on the inside; burning an itching all over on the inside; throw-up; feeling really weird/ horrible/ Miserable; Feeling hot; headache; stomach hurting; chest bothering/uncomfortable feeling in chest; Feeling like I could not breath; nauseous; Chest starting hurting; heart started racing; just said allergic reaction; This spontaneous case was reported by a consumer and describes the occurrence of PRURITUS (itchy/an itching all over on the inside), BURNING SENSATION (burning an itching all over on the inside), VOMITING (throw-up), FEELING ABNORMAL (feeling really weird/ horrible/ Miserable), FEELING HOT (Feeling hot), HEADACHE (headache), ABDOMINAL PAIN UPPER (stomach hurting), CHEST DISCOMFORT (chest bothering/uncomfortable feeling in chest), DYSPNOEA (Feeling like I could not breath), NAUSEA (nauseous), CHEST PAIN (Chest starting hurting), PALPITATIONS (heart started racing) and HYPERSENSITIVITY (just said allergic reaction) in a 29-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination.     The patient's past medical history included COVID-19 (5 or 6 days, treatment received: They gave me pain medicine and Benadryl. 11th 12 or 13th of July 2020 (testing done in hospital)) in July 2020. Concurrent medical conditions included Neurofibromatosis, type 1 (von Recklinghausen's disease) (since 4 years old). Concomitant products included GABAPENTIN and MORPHINE for an unknown indication.    On 26-Aug-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 26-Aug-2021, the patient experienced PRURITUS (itchy/an itching all over on the inside) (seriousness criterion medically significant), BURNING SENSATION (burning an itching all over on the inside) (seriousness criterion medically significant), VOMITING (throw-up) (seriousness criterion medically significant), FEELING ABNORMAL (feeling really weird/ horrible/ Miserable) (seriousness criterion medically significant), FEELING HOT (Feeling hot) (seriousness criterion medically significant), HEADACHE (headache) (seriousness criterion medically significant), ABDOMINAL PAIN UPPER (stomach hurting) (seriousness criterion medically significant), CHEST DISCOMFORT (chest bothering/uncomfortable feeling in chest) (seriousness criterion medically significant), DYSPNOEA (Feeling like I could not breath) (seriousness criterion medically significant), NAUSEA (nauseous) (seriousness criterion medically significant), CHEST PAIN (Chest starting hurting) (seriousness criterion medically significant), PALPITATIONS (heart started racing) (seriousness criterion medically significant) and HYPERSENSITIVITY (just said allergic reaction) (seriousness criterion medically significant). The patient was treated with EPINEPHRINE (EPIPEN) for Adverse event, at an unspecified dose and frequency; DIPHENHYDRAMINE HYDROCHLORIDE (BENADRYL [DIPHENHYDRAMINE HYDROCHLORIDE]) (intravenous) for Adverse event, at a dose of 25 milligram; CALCIUM for Adverse event, at an unspecified dose and frequency; ONDANSETRON HYDROCHLORIDE DIHYDRATE (ZOFRAN [ONDANSETRON HYDROCHLORIDE DIHYDRATE]) for Adverse event, at an unspecified dose and frequency; KETOROLAC TROMETHAMINE (TORADOL) for Adverse event, at an unspecified dose and frequency and PREDNISONE for Adverse event, at an unspecified dose and frequency. At the time of the report, PRURITUS (itchy/an itching all over on the inside), BURNING SENSATION (burning an itching all over on the inside), FEELING HOT (Feeling hot), CHEST DISCOMFORT (chest bothering/uncomfortable feeling in chest) and HYPERSENSITIVITY (just said allergic reaction) had not resolved and VOMITING (throw-up), FEELING ABNORMAL (feeling really weird/ horrible/ Miserable), HEADACHE (headache), ABDOMINAL PAIN UPPER (stomach hurting), DYSPNOEA (Feeling like I could not breath), NAUSEA (nauseous), CHEST PAIN (Chest starting hurting) and PALPITATIONS (heart started racing) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In 2021, Blood test: normal (normal) normal.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       other treatment medications included oxygen therapy, steroidal medications.  patient reported, treating with Benadryl 25 mg did not stopped her itching.  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. However, more information is required for further assessment.; 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. However, more information is required for further assessment.