arm pain; pain occurs: when lifting the elbow above the shoulder, any movement feels like getting hit with a bat, can't take shirt off; cannot sleep; pain gotten worse starting about 15-20 days ago; cannot concentrate; flu-like symptoms/felt sick; headache; This spontaneous case was reported by a consumer and describes the occurrence of PAIN IN EXTREMITY (arm pain), ARTHROPATHY (pain occurs: when lifting the elbow above the shoulder, any movement feels like getting hit with a bat, can't take shirt off), INSOMNIA (cannot sleep), PAIN (pain gotten worse starting about 15-20 days ago) and DISTURBANCE IN ATTENTION (cannot concentrate) in a 51-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 044B21A and 045A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No medical history for the patient was reported.  Concomitant products included MULTIVITAMIN [VITAMINS NOS] and OMEGA-3 [OMEGA-3 NOS] for Product used for unknown indication.   On 16-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 13-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 17-Mar-2021, the patient experienced INFLUENZA LIKE ILLNESS (flu-like symptoms/felt sick) and HEADACHE (headache). On an unknown date, the patient experienced PAIN IN EXTREMITY (arm pain), ARTHROPATHY (pain occurs: when lifting the elbow above the shoulder, any movement feels like getting hit with a bat, can't take shirt off), INSOMNIA (cannot sleep), PAIN (pain gotten worse starting about 15-20 days ago) and DISTURBANCE IN ATTENTION (cannot concentrate). The patient was treated with PARACETAMOL (TYLENOL) at an unspecified dose and frequency; IBUPROFEN at an unspecified dose and frequency; NAPROXEN SODIUM (ALEVE) at an unspecified dose and frequency; Bed rest (cold compress and rest) for Pain in extremity; Bed rest (cold compress and rest) for Arthropathy; Bed rest (cold compress and rest) for Insomnia; Bed rest (cold compress and rest) for Pain; Bed rest (cold compress and rest) for Disturbance in attention; Bed rest (cold compress and rest) for Influenza like illness and Bed rest (cold compress and rest) for Headache. On 17-Mar-2021, INFLUENZA LIKE ILLNESS (flu-like symptoms/felt sick) and HEADACHE (headache) had resolved. At the time of the report, PAIN IN EXTREMITY (arm pain) had not resolved and ARTHROPATHY (pain occurs: when lifting the elbow above the shoulder, any movement feels like getting hit with a bat, can't take shirt off), INSOMNIA (cannot sleep), PAIN (pain gotten worse starting about 15-20 days ago) and DISTURBANCE IN ATTENTION (cannot concentrate) outcome was unknown.            The patient reported experiencing arm pain after receiving the first dose of the Moderna COVID-19 vaccine, which was given in the left arm. The patient explained when the pain occurred: when lifting the elbow above the shoulder, any movement feels like getting hit with a bat, cannot sleep and cannot concentrate. The patient stated the pain had slowly and progressively gotten worse starting about 15-20 days ago.   Most recent FOLLOW-UP information incorporated above includes: On 29-Jul-2021: Live follow up attached: No New information