While eating with chopsticks, she suddenly felt stiff in her hands and the chopsticks dropped down right out of her hand; Occasionally experienced numbness of her arms; This spontaneous case was reported by a patient family member or friend and describes the occurrence of MUSCULOSKELETAL STIFFNESS (While eating with chopsticks, she suddenly felt stiff in her hands and the chopsticks dropped down right out of her hand) and HYPOAESTHESIA (Occasionally experienced numbness of her arms) in a 78-year-old female patient who received mRNA-1273.712 (SPIKEVAX 2024-2025 PFS) for COVID-19 prophylaxis. Patient had been receiving Spikevax vaccine, and there had been no problem previously. In October 2024, the patient received dose of mRNA-1273.712 (SPIKEVAX 2024-2025 PFS) (Intramuscular use) 1 dosage form. In 2024, the patient experienced MUSCULOSKELETAL STIFFNESS (While eating with chopsticks, she suddenly felt stiff in her hands and the chopsticks dropped down right out of her hand) and HYPOAESTHESIA (Occasionally experienced numbness of her arms). At the time of the report, MUSCULOSKELETAL STIFFNESS (While eating with chopsticks, she suddenly felt stiff in her hands and the chopsticks dropped down right out of her hand) and HYPOAESTHESIA (Occasionally experienced numbness of her arms) had not resolved. Concomitant medication use information was not provided by reporter. The reaction had been going on for months. It was unknown if the patient experienced any additional symptoms/events. Treatment medication use information was not provided by reporter.