Itches to the bone; Brain fog; Cannot do his job at work; Forearm does not go to his elbow and is nothing like tendonitis; Experiencing pain; Fluid created between muscle and bone; Right arm started to swell/Swelled up; Lost function/Little use of of his arm/Other arm and legs didn't cooperate/"left one" is not listening to the brain is telling him to do; Fells terrible/Ripping/Tearing/Must dig with his fingers and arms to reach for his phone/Arm issue; This spontaneous case was reported by a consumer and describes the occurrence of MOBILITY DECREASED (Lost function/Little use of of his arm/Other arm and legs didn't cooperate/"left one" is not listening to the brain is telling him to do), LIMB DISCOMFORT (Fells terrible/Ripping/Tearing/Must dig with his fingers and arms to reach for his phone/Arm issue), PRURITUS (Itches to the bone), COGNITIVE DISORDER (Brain fog) and JOB DISSATISFACTION (Cannot do his job at work) in a 55-year-old male 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 Carpal tunnel syndrome (Diagnosed with arthritis) in 1990 and Arthritis in 1990. Concurrent medical conditions included Upper respiratory disorder (Consulted doctor every 6 to 7 weeks).   On 21-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 22-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. In May 2021, the patient experienced MOBILITY DECREASED (Lost function/Little use of of his arm/Other arm and legs didn't cooperate/"left one" is not listening to the brain is telling him to do), LIMB DISCOMFORT (Fells terrible/Ripping/Tearing/Must dig with his fingers and arms to reach for his phone/Arm issue) and PERIPHERAL SWELLING (Right arm started to swell/Swelled up). On an unknown date, the patient experienced PRURITUS (Itches to the bone), COGNITIVE DISORDER (Brain fog), JOB DISSATISFACTION (Cannot do his job at work), TENDONITIS (Forearm does not go to his elbow and is nothing like tendonitis), PAIN (Experiencing pain) and BURSAL FLUID ACCUMULATION (Fluid created between muscle and bone). The patient was treated with DICLOFENAC SODIUM for Adverse event, at a dose of unknown. At the time of the report, MOBILITY DECREASED (Lost function/Little use of of his arm/Other arm and legs didn't cooperate/"left one" is not listening to the brain is telling him to do) had not resolved and LIMB DISCOMFORT (Fells terrible/Ripping/Tearing/Must dig with his fingers and arms to reach for his phone/Arm issue), PRURITUS (Itches to the bone), COGNITIVE DISORDER (Brain fog), JOB DISSATISFACTION (Cannot do his job at work), TENDONITIS (Forearm does not go to his elbow and is nothing like tendonitis), PAIN (Experiencing pain), BURSAL FLUID ACCUMULATION (Fluid created between muscle and bone) and PERIPHERAL SWELLING (Right arm started to swell/Swelled up) outcome was unknown.            No concomitant medication was reported by reporter.   Most recent FOLLOW-UP information incorporated above includes: On 22-Jul-2021: Follow up information was received and an event pain added. On 27-Jul-2021: TCR was received and contains no new information.