Increased sedimentation rate; Intermittent temperature deviations/body temperature fluctuations; Warm flushed feeling within the upper trunk of my body, upper extremities, neck and face; This spontaneous case was reported by a consumer and describes the occurrence of FLUSHING (Warm flushed feeling within the upper trunk of my body, upper extremities, neck and face), RED BLOOD CELL SEDIMENTATION RATE INCREASED (Increased sedimentation rate) and BODY TEMPERATURE FLUCTUATION (Intermittent temperature deviations/body temperature fluctuations) in a 37-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination.     Previously administered products included for Drug use for unknown indication: Flu vaccine. Past adverse reactions to the above products included No adverse event with Flu vaccine. Concurrent medical conditions included Polio (when patient was 1 year old (spinal polio)).    On 19-Jul-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. In 2021, the patient experienced FLUSHING (Warm flushed feeling within the upper trunk of my body, upper extremities, neck and face). In July 2021, the patient experienced BODY TEMPERATURE FLUCTUATION (Intermittent temperature deviations/body temperature fluctuations). On an unknown date, the patient experienced RED BLOOD CELL SEDIMENTATION RATE INCREASED (Increased sedimentation rate). On 25-Oct-2021, BODY TEMPERATURE FLUCTUATION (Intermittent temperature deviations/body temperature fluctuations) had resolved. At the time of the report, FLUSHING (Warm flushed feeling within the upper trunk of my body, upper extremities, neck and face) and RED BLOOD CELL SEDIMENTATION RATE INCREASED (Increased sedimentation rate) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 25-Oct-2021, Body temperature: 99.4 to 101.8 degrees (High) 99.4 to 101.8 degrees. On an unknown date, Blood follicle stimulating hormone: normal (normal) normal range. On an unknown date, Blood test: unremarkable Unremarkable. On an unknown date, Body temperature: 99.4 to 101.8 (High) temperature was 99.4 to 101.8 degrees. On an unknown date, Computerised tomogram: unremarkable unremarkable. On an unknown date, Red blood cell sedimentation rate increased: high (High) Elevated sedimentation rate. On an unknown date, Thyroid function test: normal (normal) Thyroid normal range.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown.       No Concomitant and treatment medications were reported.  The patient reported that when she experienced these temperature fluctuations, she did not sweat or perspire or wake up soaking the sheets. It was just a flushed feeling that would last anywhere from 30 mins to a couple hours throughout the day and she would have approx. 5-7 episodes of these throughout the day. Originally, she thought it was hot flashes given at her age, but she started carrying a thermometer, as a matter of fact she carried 3 different ones, to make sure the flushed feeling was consistent. The highest it registered was 101.8. Patient's fluctuations came on 1-2 days after the 1st dose and lasted 3.5 months consistently (lingering) with approx. 5-7 flushed episodes throughout the day, every day for the first month then it tapered off to 3-4 times a week afterwards until late October during her last reported episode. During these episodes, her vitals were stable, and she never had the shakes or chills; nothing else was effected or felt, that she was aware of.