Had a severe allergic reaction; headache; My heart rate was really high it was 124; Tachycardia; nerve pain; cyanotic; started to get dizzy and felt weird; headrush; started to get dizzy and felt weird; headrush; I was placed in a wheelchair because I couldn't walk; my throat was irritated; my mouth got dry; muscle spasm; abdominal pain; my blood pressure was 80 something over 50; I was cold and shaking; I was cold and shaking; arm began to hurt; This spontaneous case was reported by an other health care professional (subsequently medically confirmed) and describes the occurrence of TACHYCARDIA (My heart rate was really high it was 124; Tachycardia), NEURALGIA (nerve pain), CYANOSIS (cyanotic), DIZZINESS (started to get dizzy and felt weird; headrush) and FEELING ABNORMAL (started to get dizzy and felt weird; headrush) in a 37-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 039K20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Tubal ligation. Concurrent medical conditions included Food allergy (causes her throat to shut), Fruit allergy (Causes her mouth to swell up), Contrast media allergy (makes her have contact dermatitis), Benzoin allergy and Irritable bowel syndrome.    On 07-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 07-Jan-2021, the patient experienced TACHYCARDIA (My heart rate was really high it was 124; Tachycardia), NEURALGIA (nerve pain), CYANOSIS (cyanotic), DIZZINESS (started to get dizzy and felt weird; headrush), FEELING ABNORMAL (started to get dizzy and felt weird; headrush), GAIT DISTURBANCE (I was placed in a wheelchair because I couldn't walk), THROAT IRRITATION (my throat was irritated), DRY MOUTH (my mouth got dry), MUSCLE SPASMS (muscle spasm), ABDOMINAL PAIN (abdominal pain), HYPOTENSION (my blood pressure was 80 something over 50), FEELING COLD (I was cold and shaking), TREMOR (I was cold and shaking), PAIN IN EXTREMITY (arm began to hurt) and HEADACHE (headache). On an unknown date, the patient experienced HYPERSENSITIVITY (Had a severe allergic reaction). The patient was treated with DIPHENHYDRAMINE HYDROCHLORIDE (BENADRYL A) 07-Jan-2021 at a dose of 50 mg; FAMOTIDINE (PEPCID [FAMOTIDINE]) 07-Jan-2021 at a dose of 20 mg; PREDNISONE 07-Jan-2021 at a dose of 20 mg and ALBUTEROL [SALBUTAMOL] 07-Jan-2021 at an unspecified dose and frequency. At the time of the report, TACHYCARDIA (My heart rate was really high it was 124; Tachycardia), NEURALGIA (nerve pain), CYANOSIS (cyanotic), DIZZINESS (started to get dizzy and felt weird; headrush), FEELING ABNORMAL (started to get dizzy and felt weird; headrush), GAIT DISTURBANCE (I was placed in a wheelchair because I couldn't walk), THROAT IRRITATION (my throat was irritated), DRY MOUTH (my mouth got dry), MUSCLE SPASMS (muscle spasm), ABDOMINAL PAIN (abdominal pain), HYPOTENSION (my blood pressure was 80 something over 50), FEELING COLD (I was cold and shaking), TREMOR (I was cold and shaking), PAIN IN EXTREMITY (arm began to hurt), HYPERSENSITIVITY (Had a severe allergic reaction) and HEADACHE (headache) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 07-Jan-2021, Blood pressure measurement: 80/50 (Inconclusive) Inconclusive. On 07-Jan-2021, Heart rate: 124 (High) High. On 07-Jan-2021, Oxygen saturation: 89 (Inconclusive) Inconclusive.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.   For mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular), the reporter did not provide any causality assessments.   No concomitant medications were provided by the reporter.   Most recent FOLLOW-UP information incorporated above includes: On 07-Apr-2021: No specific follow-up information recorded. On 07-Apr-2021: New event ( hypersensitivity ) was added.; 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.