swollen muscle; feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit; cannot sleep at night; feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit; feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit; throbbing pain / feeling throbbing pain in different parts of his right arm from neck to big muscle of his arm,; tender and swollen muscle/from neck to big muscle of his arm; This spontaneous case was reported by a patient and describes the occurrence of MUSCLE SWELLING (swollen muscle), AXILLARY PAIN (feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit), INSOMNIA (cannot sleep at night), NECK PAIN (feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit) and PAIN IN EXTREMITY (feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit) in a 67-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 046C21A, 002C21A and 031A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 11-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 21-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 08-Sep-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 11-Sep-2021, the patient experienced MUSCLE SWELLING (swollen muscle), AXILLARY PAIN (feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit), INSOMNIA (cannot sleep at night), NECK PAIN (feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit), PAIN IN EXTREMITY (feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit), PAIN (throbbing pain / feeling throbbing pain in different parts of his right arm from neck to big muscle of his arm,) and MYALGIA (tender and swollen muscle/from neck to big muscle of his arm). At the time of the report, MUSCLE SWELLING (swollen muscle) and MYALGIA (tender and swollen muscle/from neck to big muscle of his arm) outcome was unknown and AXILLARY PAIN (feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit), INSOMNIA (cannot sleep at night), NECK PAIN (feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit), PAIN IN EXTREMITY (feeling throbbing pain of his right arm from neck to big muscle of his arm, including armpit) and PAIN (throbbing pain / feeling throbbing pain in different parts of his right arm from neck to big muscle of his arm,) had not resolved.            No concomitant medication reported.  No treatment medication reported  On day 3 to 4, he developed a tender and swollen muscle in his right arm. Caller said he was feeling throbbing pain in different parts of his right arm from neck to big muscle of his arm, including armpit, and due to which he could not sleep at night.   This case was linked to MOD-2021-320310 (Patient Link).