O2 levels where they'd be mid 90s and would walk a little and go down to 79%; weakness; shaking; shortness of breath; unable to get out bed; heart rate would go into the 100s with minimal exertion; myalgia in neck and shoulder; chills; 103F fever; This spontaneous case was reported by a physician and describes the occurrence of HYPOXIA (O2 levels where they'd be mid 90s and would walk a little and go down to 79%) in a 76-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below. The patient's past medical history included COVID-19 (had COVID19 at the end of October) in October 2020, Fever (beginning of November 2020 where she presented fever, myalgia, loss of appetite that lasted about 2 weeks then she was back to normal.) in November 2020, Myalgia (beginning of November 2020 where she presented fever, myalgia, loss of appetite that lasted about 2 weeks then she was back to normal.) in November 2020 and Appetite lost (beginning of November 2020 where she presented fever, myalgia, loss of appetite that lasted about 2 weeks then she was back to normal.) in November 2020.Concurrent medical conditions included Hypertension (for which she takes a small dose of an antihypertensive medication). On 12-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 12-Feb-2021, the patient experienced HYPOXIA (O2 levels where they'd be mid 90s and would walk a little and go down to 79%) (seriousness criterion medically significant), ASTHENIA (weakness), TREMOR (shaking), DYSPNOEA (shortness of breath), HYPOKINESIA (unable to get out bed), HEART RATE INCREASED (heart rate would go into the 100s with minimal exertion), MYALGIA (myalgia in neck and shoulder), CHILLS (chills) and PYREXIA (103F fever). At the time of the report, HYPOXIA (O2 levels where they'd be mid 90s and would walk a little and go down to 79%), ASTHENIA (weakness), TREMOR (shaking), DYSPNOEA (shortness of breath), HYPOKINESIA (unable to get out bed), HEART RATE INCREASED (heart rate would go into the 100s with minimal exertion), MYALGIA (myalgia in neck and shoulder), CHILLS (chills) and PYREXIA (103F fever) outcome was unknown. DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In 2021, Angiogram: negative (Negative) Negative. In 2021, COVID-19: negative (Negative) Negative. In 2021, Cardiac stress test: negative (Negative) Negative. In 2021, Electrocardiogram ambulatory: negative (Negative) Negative.NThe action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) was unknown. For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments. Concomitant products included ANTIHYPERTENSIVES for Hypertension.BHer neck and shoulder pain persisted so she used Lidoderm topical and muscle relaxers which seemed to help as well as resting. Her doctor also advised she go to physical therapy to help.NBased 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.NThis case was linked to MOD-2021-103020 (Patient Link).; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start date of the event,s a causal relationship cannot be excluded.