Rapid heart rate; Resting heart rate of 78, that's low for her; Can't function; Having a lot of phlegm; Pounding heart; Rash; Exhausted, super tired/totally fatigued; Body aches; Injection site swelling; headaches; This spontaneous case was reported by a consumer and describes the occurrence of HEART RATE INCREASED (Rapid heart rate), HEART RATE DECREASED (Resting heart rate of 78, that's low for her), LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (Can't function), PRODUCTIVE COUGH (Having a lot of phlegm) and PALPITATIONS (Pounding heart) in a 64-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 012H218, 018B21A and 030A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concurrent medical conditions included Tachycardia.   On 06-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 03-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 30-Nov-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On an unknown date, the patient experienced HEART RATE INCREASED (Rapid heart rate), HEART RATE DECREASED (Resting heart rate of 78, that's low for her), LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (Can't function), PRODUCTIVE COUGH (Having a lot of phlegm), PALPITATIONS (Pounding heart), RASH (Rash), FATIGUE (Exhausted, super tired/totally fatigued), MYALGIA (Body aches), INJECTION SITE SWELLING (Injection site swelling) and HEADACHE (headaches). At the time of the report, HEART RATE INCREASED (Rapid heart rate), PALPITATIONS (Pounding heart), RASH (Rash) and INJECTION SITE SWELLING (Injection site swelling) outcome was unknown, HEART RATE DECREASED (Resting heart rate of 78, that's low for her), LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (Can't function), PRODUCTIVE COUGH (Having a lot of phlegm), FATIGUE (Exhausted, super tired/totally fatigued) and HEADACHE (headaches) had not resolved and MYALGIA (Body aches) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Heart rate decreased: 78 (Low) resting heart rate of 78. On an unknown date, Heart rate increased: 'results not reported Heart rate increased.         No Concomitant product use was reported.  The patient reported that they had rapid heart rate and took pills, had fatigue. After the booster the patient was exhausted, can't function, super tired, having a lot of phlegm. The patient was taking cold medicine. The patient also reported that they had headaches and was totally fatigued and had body aches that went away in a day. Reportedly, everything else was still ongoing. The patient also had a rash and injection site swelling and had very rapid heart rate.   It was reported that the patient had been diagnosed previously with tachycardia and had stopped taking the medications before the shot. Now the patient had a resting heart rate of 78 and that was low for them. The patient also had a pounding heart and stated that they do not think they had covid and never tested positive.  Treatment medications reported included pills for the rapid heart rate and cold medicine.   Most recent FOLLOW-UP information incorporated above includes: On 10-Dec-2021: Follow-up included no new information