short of breath; rash / red flushing; Chills; Fever; Body aches; shaky when she work up; sinus Tachycardia; This spontaneous case was reported by a consumer and describes the occurrence of TREMOR (shaky when she work up), SINUS TACHYCARDIA (sinus Tachycardia), DYSPNOEA (short of breath), RASH (rash / red flushing) and CHILLS (Chills) in a female patient of an unknown age who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 046C21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 03-Sep-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 01-Oct-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 02-Oct-2021, the patient experienced TREMOR (shaky when she work up), SINUS TACHYCARDIA (sinus Tachycardia), CHILLS (Chills), PYREXIA (Fever) and MYALGIA (Body aches). On 03-Oct-2021, the patient experienced RASH (rash / red flushing). On an unknown date, the patient experienced DYSPNOEA (short of breath). At the time of the report, TREMOR (shaky when she work up), CHILLS (Chills), PYREXIA (Fever) and MYALGIA (Body aches) outcome was unknown, SINUS TACHYCARDIA (sinus Tachycardia) and DYSPNOEA (short of breath) had not resolved and RASH (rash / red flushing) had resolved.            Concomitant medication was not reported.  Treatment information was not reported.  Patient Reported on 2-Oct-2021 symptoms of chills, fever, body aches, heart rate was elevated from 105 to over 138 throughout the day and heart rate did not slow down by 10/3/21, she as go to the hospital to be checked out.   She spoke with the nurse hotline for my insurance and she advised that I go to the emergency room as, when at rest, my heart rate was at 105 to 110 bpm and when walking around the house it would rise to over 120.  On 12-OCT-2021, she still have issues with heart rate. As an example, normal activities like washing the dishes make her heart race to 130 bpm and  get short of breath. Once her heart rate rises, it takes considerable time for it to go below 100 bpm (24 minutes to up to 2 hours). Normal activities have been impacted like gardening, running the vacuum, cooking, putting up groceries or dishes. She got winded and heart rate speeds up considerably more than prior to the 2nd dose of the vaccine.  Patient stated that she went to the Atrium Medical Center Emergency Room on 3-OCT-2021 where tests were conducted and she was released with a diagnosis of sinus tachycardia. They performed an ECG, CT Scan, EKG, Chest X-ray, Basic metabolic panel, Troponin T, D-Dimer, Complete blood count with differential. She was given an IV drip to lower her heart rate.  At the hospital, she had developed a rash / red flushing around my midsection. The rash/redness has since gone away which took several days (it spread during that time to my neck and into my hairline).   Most recent FOLLOW-UP information incorporated above includes: On 12-Oct-2021: significant Follow-Up Included: Patient Detail and event are updated.; Sender's Comments: This case concerns a female patient of unknown age with no previous relevant medical history, who experienced the unexpected non serious event/AESI of Sinus tachycardia and other associated non serious events after Spikevax (mRNA- 1273 vaccine / Moderna COVID-19 Vaccine). The event occurred approximately 1 day after the second dose of Spikevax and was ongoing 10 days later. The patient consulted to the emergency room. Electrocardiogram, Chest X-ray, basic metabolic panel, Troponin T, D-Dimer and complete blood count with differential showed no other positive findings. The rechallenge is not applicable, since the schedule of vaccination has been completed and a further dose is not expected. The benefit-risk relationship of Spikevax vaccine is not affected by this report