STIFFNESS IN LEFT ARM; Pain in arm; lost arm; like contracture; In the arm where he received the injection (L arm) he lost mobility/could not move his arm; Could not sleep; Disabling pain in entire left arm/Sore spot next to the injection site; Left side arm was warmer than the right side arm; Body ache on the left side/sevre pain/intense pain/sore spot near the patella; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of MUSCULOSKELETAL STIFFNESS (STIFFNESS IN LEFT ARM), PAIN IN EXTREMITY (Pain in arm), MUSCLE CONTRACTURE (like contracture), INJECTED LIMB MOBILITY DECREASED (In the arm where he received the injection (L arm) he lost mobility/could not move his arm) and INSOMNIA (Could not sleep) in a 48-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 003B21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concurrent medical conditions included Seasonal allergy, Penicillin allergy, Food allergy and Drug allergy (Allergy to medications reported.). Concomitant products included ACRIVASTINE (BENADRYL ALLERGY RELIEF) for an unknown indication.    On 14-Apr-2021 at 9:59 AM, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 17-Apr-2021, the patient experienced MUSCLE CONTRACTURE (like contracture), INJECTED LIMB MOBILITY DECREASED (In the arm where he received the injection (L arm) he lost mobility/could not move his arm), INSOMNIA (Could not sleep), PAIN IN EXTREMITY (Disabling pain in entire left arm/Sore spot next to the injection site), FEELING HOT (Left side arm was warmer than the right side arm) and PAIN (Body ache on the left side/sevre pain/intense pain/sore spot near the patella). On 18-Apr-2021, the patient experienced MUSCULOSKELETAL STIFFNESS (STIFFNESS IN LEFT ARM), PAIN IN EXTREMITY (Pain in arm) and LIMB DEFORMITY (lost arm). The patient was treated with CELECOXIB (CELEBREX) at a dose of 200 mg,every 12 hours and CARISOPRODOL, METAMIZOLE SODIUM (SOMA COMPLEX) at a dose of 350 mg,every 8 hours. On 23-Apr-2021, LIMB DEFORMITY (lost arm) had resolved. At the time of the report, MUSCULOSKELETAL STIFFNESS (STIFFNESS IN LEFT ARM), PAIN IN EXTREMITY (Pain in arm), MUSCLE CONTRACTURE (like contracture), INSOMNIA (Could not sleep), PAIN IN EXTREMITY (Disabling pain in entire left arm/Sore spot next to the injection site), FEELING HOT (Left side arm was warmer than the right side arm) and PAIN (Body ache on the left side/sevre pain/intense pain/sore spot near the patella) outcome was unknown and INJECTED LIMB MOBILITY DECREASED (In the arm where he received the injection (L arm) he lost mobility/could not move his arm) had not resolved.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.   For mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular), the reporter did not provide any causality assessments.   Patient race included other/Caribbean. Concomitant medication included only Benadryl on allergies season.   Most recent FOLLOW-UP information incorporated above includes: On 03-May-2021: Follow up translated document included  additional reporter details, patient demographics, medical history, events and outcome