could not function properly; Brachial neuritis; Nerve pain; Left arm pain/ Excruciating pain from the; Pain in tendons; Pain in the lymph nodes; Area under my left arm ( armpit ) pain; Left shoulder have unbearably painful; This spontaneous case was reported by a consumer and describes the occurrence of RADICULITIS BRACHIAL (Brachial neuritis), NEURALGIA (Nerve pain), PAIN IN EXTREMITY (Left arm pain/ Excruciating pain from the), LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (could not function properly) and TENDON PAIN (Pain in tendons) in a 78-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 031L20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included COVID-19 (Recovered after 4 weeks.) on 10-Nov-2020. Concomitant products included METOPROLOL, CEFALEXIN MONOHYDRATE (LEXIPRON), MONTELUKAST SODIUM (SINGULAIR), ATORVASTATIN CALCIUM (LIPITOR), METFORMIN, IRBESARTAN, ATORVASTATIN, ESCITALOPRAM, FAMOTIDINE, EZETIMIBE, MELOXICAM, METOPROLOL TARTRATE, MONTELUKAST, NITROFURANTOIN (NITROFURANTOIN MONO/MAC), OMEPRAZOLE, SEMAGLUTIDE (OZEMPIC), RABEPRAZOLE and SILODOSIN for an unknown indication.    On 12-Feb-2021 at 2:15 PM, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 12-Feb-2021, the patient experienced ARTHRALGIA (Left shoulder have unbearably painful). On 13-Feb-2021, the patient experienced PAIN IN EXTREMITY (Left arm pain/ Excruciating pain from the). 13-Feb-2021, the patient experienced TENDON PAIN (Pain in tendons), LYMPH NODE PAIN (Pain in the lymph nodes) and AXILLARY PAIN (Area under my left arm ( armpit ) pain). On an unknown date, the patient experienced RADICULITIS BRACHIAL (Brachial neuritis), NEURALGIA (Nerve pain) and LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (could not function properly). The patient was treated with IBUPROFEN (ADVIL [IBUPROFEN]) at an unspecified dose and frequency; PREDNISONE at an unspecified dose and frequency; HYDROMORPHONE at an unspecified dose and frequency; GABAPENTIN at an unspecified dose and frequency; PREGABALIN (LYRICA) at an unspecified dose and frequency and AMITRIPTYLINE at an unspecified dose and frequency. On 15-Jun-2021, PAIN IN EXTREMITY (Left arm pain/ Excruciating pain from the) had resolved with sequelae. On 16-Jun-2021, LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (could not function properly) had resolved. At the time of the report, RADICULITIS BRACHIAL (Brachial neuritis), NEURALGIA (Nerve pain), TENDON PAIN (Pain in tendons), LYMPH NODE PAIN (Pain in the lymph nodes), AXILLARY PAIN (Area under my left arm ( armpit ) pain) and ARTHRALGIA (Left shoulder have unbearably painful) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 10-Nov-2020, SARS-CoV-2 test: positive (Positive) Positive. On 29-Dec-2020, SARS-CoV-2 test: negative (Negative) Negative. On an unknown date, Blood test: results unknown (Inconclusive) Results unknown. On an unknown date, Computerised tomogram: abnormal (abnormal) Showed some activity in the lymph nodes.     The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       The patient stated that nerve pain was so severe and could not function properly for more than three months. On 16-Jun- 2021 the patient felt fine and able to work   Most recent FOLLOW-UP information incorporated above includes: On 23-Jun-2021: Follow up information was received from initial reporter: Patient' DOB, race, ethnicity, height, and weight were added. New events radiculitis brachial, Neuralgia, Lymph node pain, Tendon pain and Loss of personal independence in daily activities were added. Event outcome for Pain in extremity was updated and reporter causality was updated from not reported to possible. Vaccine batch number was added. Concomitant medications, additional laboratory test and treatment medications were added.   This case was upgraded from non-serious to serious due to the addition of new event radiculitis brachial