Cannot even walk around normally; swollen lymph nodes; patient cannot walk with out dizziness; Dizziness with room spinning; Unstable blood pressure; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of DIZZINESS POSTURAL (patient cannot walk with out dizziness) in an 18-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 036A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included No adverse event (No medical history reported.).    On 09-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 09-Feb-2021, the patient experienced DIZZINESS POSTURAL (patient cannot walk with out dizziness) (seriousness criterion disability), DIZZINESS (Dizziness with room spinning) and BLOOD PRESSURE FLUCTUATION (Unstable blood pressure). On 13-Feb-2021, the patient experienced LYMPHADENOPATHY (swollen lymph nodes). On an unknown date, the patient experienced GAIT INABILITY (Cannot even walk around normally). At the time of the report, DIZZINESS POSTURAL (patient cannot walk with out dizziness), DIZZINESS (Dizziness with room spinning), BLOOD PRESSURE FLUCTUATION (Unstable blood pressure), GAIT INABILITY (Cannot even walk around normally) and LYMPHADENOPATHY (swollen lymph nodes) had not resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 09-Feb-2021, Heart rate: increased (High) increased.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.       Relevant Text: The Patient's mother reported that the patient received their first dose on 9 Feb 2021 and approximately 10 minutes post receiving the vaccine the patient developed severe dizziness and had an increase in their heart rate. The patient also had an unstable blood pressure.  Few days later, the patient developed swelling in their lymph nodes. The reporter reported that the symptoms were still ongoing and now the patient cannot even walk without dizziness. It was also reported that the patient cannot even get back to the competitive sports and was not able to walk around anymore normally. The patient had multiple visits to the cardiologist, ENT, and pediatrician with no clear explanation of what happened to the patient.  No Concomitant product use was reported.  No treatment information was provided.  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. Looking at the clinical scenario, the event postural dizziness is persisting 6wks from onset with no clear explanation, it is assessed as a SAE (disability). However, medical history and concomitant medications, reports of tests/diagnostics are needed for further assessment. Additional information is requested.; 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. Looking at the clinical scenario, the event postural dizziness is persisting 6wks from onset with no clear explanation, it is assessed as a SAE (disability). However, medical history and concomitant medications, reports of tests/diagnostics are needed for further assessment. Additional information is requested.