Left arm was now red; Left arm was swollen; Back pain all the way up her back; Couldn't see right as everything was sepia in color; Passed out in her bathroom; Stopped breathing; Achy; Low grade temperature; sore left arm, which was the injection arm; This spontaneous case was reported by a nurse and describes the occurrence of BACK PAIN (Back pain all the way up her back), VISUAL IMPAIRMENT (Couldn't see right as everything was sepia in color), MYALGIA (Achy), VACCINATION SITE ERYTHEMA (Left arm was now red) and VACCINATION SITE SWELLING (Left arm was swollen) in a 66-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 031H21A, 010A21A and 039K20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 04-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 04-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 07-Dec-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 08-Dec-2021, the patient experienced MYALGIA (Achy), PYREXIA (Low grade temperature) and VACCINATION SITE PAIN (sore left arm, which was the injection arm). On 09-Dec-2021, the patient experienced BACK PAIN (Back pain all the way up her back), VISUAL IMPAIRMENT (Couldn't see right as everything was sepia in color), LOSS OF CONSCIOUSNESS (Passed out in her bathroom) and DYSPNOEA (Stopped breathing). On 10-Dec-2021, the patient experienced VACCINATION SITE ERYTHEMA (Left arm was now red) and VACCINATION SITE SWELLING (Left arm was swollen). On 09-Dec-2021, LOSS OF CONSCIOUSNESS (Passed out in her bathroom) and DYSPNOEA (Stopped breathing) had resolved. At the time of the report, BACK PAIN (Back pain all the way up her back), VISUAL IMPAIRMENT (Couldn't see right as everything was sepia in color), MYALGIA (Achy), VACCINATION SITE ERYTHEMA (Left arm was now red), VACCINATION SITE SWELLING (Left arm was swollen), PYREXIA (Low grade temperature) and VACCINATION SITE PAIN (sore left arm, which was the injection arm) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 08-Dec-2021, Body temperature: high (High) Low grade temperature. On 09-Dec-2021, Chest X-ray: normal (normal) normal. On 09-Dec-2021, Electrocardiogram: normal (normal) normal. On 09-Dec-2021, Full blood count: normal (normal) Complete blood count done and results were normal.. On 09-Dec-2021, Lymphocyte count (25-40): 22.5 (Low) Lymphocytes were low. On 09-Dec-2021, Monocyte count (4-10): 10.4 (High) Monocytes were high. On 09-Dec-2021, Neutrophil count (50-60): 65 (High) Neutrophils were a little elevated. On 09-Dec-2021, Troponin: normal (normal) Troponin test done and the results were normal.. On 09-Dec-2021, Urine analysis: normal (normal) normal.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   No concomitant medications reported. No treatment medication reported.   This case was linked to MOD-2021-408588 (Patient Link).